sport

A sport is commonly defined as an organized, competitive, and skillful physical activity requiring commitment and fair play. It is governed by a set of rules or customs. In a sport the key factors are the physical capabilities and skills of the competitor when determining the outcome (winning or losing). The physical activity involves the movement of people, animals and/or a variety of objects such as balls and machines. In contrast, games such as card games and board games, though these could be called mind sports, require only mental skills. Non-competitive activities such as jogging and rock-climbing, are usually classified as recreations. Physical events such as scoring goals or crossing a line first often define the result of a sport. However the degree of skill in some sports such as diving, dressage and figure skating is judged according to well-defined criteria. This is in contrast with other judged activities such as beauty pageants and body-building shows, where skill does not have to be shown and the criteria are not as well defined. Accurate records are kept and updated for most sports at the highest levels, while failures and accomplishments are widely announced in sport news. Sports are most often played just for fun or for the simple fact that people need exercise to stay in good physical condition. However professional sport is a major source of entertainment. Although they do not always succeed, sports participants are expected to display good sportsmanship, standards of conduct such as being respectful of opponents and officials, and congratulating the winner when losing.

netball

Netball is a ball sport played between two teams of seven players. The sport shares many similarities with basketball, having been derived from early versions of women's basketball. It developed as a distinct sport in the 1890s in England, from where it spread to other countries. Netball is popular in Commonwealth nations and is predominantly played by women. Games are played on a rectangular court divided into thirds, with a raised goal at each short end. The object of the game is for teams to score points by passing a ball and shooting it into the opposing team's goal. Players are assigned "positions" that define their role within the team and restrict their movement on court. During general play, a player with the ball can take no more than one step before passing it, and cannot hold the ball for longer than three seconds. Goals can only be scored by the assigned shooting players, and successful shots score one point each. Netball games are 60 minutes long, divided into 15-minute quarters, at the end of which the team with the most points scored wins. The sport is administered globally by the International Federation of Netball Associations (IFNA), and is reportedly played by over 20 million people in more than 70 countries.[1] Local-level participation is widespread in Commonwealth nations, particularly in schools, although international competition and domestic leagues only receive substantial recognition in a few countries. The highest level of international netball includes the Netball World Championships, the netball event at the Commonwealth Games, and the World Netball Series

volleyball

Volleyball

Volleyball

Volleyball is an Olympic team sport in which two teams of 6 players are separated by a net. Each team tries to score points by grounding a ball on the other team's court under organized rules.[1] This article focuses on competitive indoor volleyball; numerous other variations of volleyball have developed, most notably the Olympic spin-off sport beach volleyball.
The complete rules are extensive. But simply, play proceeds as follows: A player on one of the teams begins a rally by serving the ball (tossing or releasing it and then hitting it with a hand or arm), from behind the back boundary line of the court, over the net, and into the receiving team's court. The receiving team must not let the ball be grounded within their court. They may touch the ball as many as three times. Typically, the first two touches are to set up for an attack, an attempt to direct the ball back over the net in such a way that the serving team is unable to prevent it from being grounded in their court.
The rally continues, with each team allowed as many as three consecutive touches, until either (1): a team makes a kill, grounding the ball on the opponent's court and winning the rally; or (2): a team commits a fault and loses the rally. The team that wins the rally is awarded a point, and serves the ball to start the next rally. A few of the most common faults include:
causing the ball to touch the ground outside the opponents' court or without first passing over the net;
catching and throwing the ball;
double hit: two consecutive contacts with the ball made by the same player;
four consecutive contacts with the ball made by the same team.
The ball is usually played with the hands or arms, but players can legally strike or push (short contact) the ball with any part of the body.
A number of consistent techniques have evolved in volleyball, including spiking and blocking (because these plays are made above the top of the net the vertical jump is an athletic skill emphasized in the sport) as well as passing, setting, and specialized player positions and offensive and defensive structures.
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History
Origin of volleyball
On February 9, 1895, in Holyoke, Massachusetts (USA), William G Morgan, a YMCA physical education director, created a new game called Mintonette as a pastime to be played preferably indoors and by any number of players. The game took some of its characteristics from tennis and handball. Another indoor sport, basketball, was catching on in the area, having been invented just ten miles (sixteen kilometers) away in the city of Springfield, Massachusetts, only four years before. Mintonette was designed to be an indoor sport less rough than basketball for older members of the YMCA, while still requiring a bit of athletic effort.
The first rules, written down by William G Morgan, called for a net 6 ft 6 in (1.98 m) high, a 25×50 ft (7.6×15.2 m) court, and any number of players. A match was composed of nine innings with three serves for each team in each inning, and no limit to the number of ball contacts for each team before sending the ball to the opponents’ court. In case of a serving error, a second try was allowed. Hitting the ball into the net was considered a foul (with loss of the point or a side-out)—except in the case of the first-try serve.
After an observer, Alfred Halstead, noticed the volleying nature of the game at its first exhibition match in 1896, played at the International YMCA Training School (now called Springfield College), the game quickly became known as volleyball (it was originally spelled as two words: "volley ball"). Volleyball rules were slightly modified by the International YMCA Training School and the game spread around the country to various YMCAs.[2][3]
Refinements and later developments
The first official ball used in volleyball is disputed; some sources say that Spalding created the first official ball in 1896, while others claim it was created in 1900.[4][5][6] The rules have evolved over time; In Philippines by 1916, the skill and power of the set and spike had been introduced, and four years later a "three hits" rule and a rule against hitting from the back row were established. In 1917, the game was changed from 21 to 15 points. In 1919, about 16,000 volleyballs were distributed by the American Expeditionary Forces to their troops and allies, which sparked the growth of volleyball in new countries.[4]
The first country outside the United States to adopt volleyball was Canada in 1900.[4] An international federation, the Fédération Internationale de Volleyball (FIVB), was founded in 1947, and the first World Championships were held in 1949 for men and 1952 for women.[7] The sport is now popular in Brazil, in Europe (where especially Italy, the Netherlands, and countries from Eastern Europe have been major forces since the late 1980s), in Russia, and in other countries including China and the rest of Asia, as well in as the United States.[2][3][7]
Beach volleyball, a variation of the game played on sand and with only two players per team, became a FIVB-endorsed variation in 1987 and was added to the Olympic program at the 1996 Summer Olympics.[4][7] Volleyball is also a sport at the Paralympics managed by the World Organisation Volleyball for Disabled
Volleyball in the Olympics
Main article: Volleyball at the Summer Olympics
The history of Olympic volleyball traces back to the 1924 Summer Olympics in Paris, where volleyball was played as part of an American sports demonstration event.[8] After the foundation of FIVB and some continental confederations, it began to be considered for official inclusion. In 1957, a special tournament was held at the 53rd IOC session in Sofia, Bulgaria to support such request. The competition was a success, and the sport was officially included in the program for the 1964 Summer Olympics.[4]
The Olympic volleyball tournament was originally a simple competition, whose format paralleled the one still employed in the World Cup: all teams played against each other team and then were ranked by wins, set average, and point average. One disadvantage of this round-robin system is that medal winners could be determined before the end of the games, making the audience lose interest in the outcome of the remaining matches. To cope with this situation, the competition was split into two phases with the addition of a "final round" elimination tournament consisting of quarterfinals, semifinals, and finals matches in 1972. The number of teams involved in the Olympic tournament has grown steadily since 1964. Since 1996, both men's and women's events count twelve participant nations. Each of the five continental volleyball confederations has at least one affiliated national federation involved in the Olympic Games.
The U.S.S.R. won men's gold in both 1964 and 1968. After taking bronze in 1964 and silver in 1968, Japan finally won the gold for men's volleyball in 1972. Women's gold went to Japan in 1964 and again in 1976. That year, the introduction of a new offensive skill, the backrow attack, allowed Poland to win the men's competition over the Soviets in a very tight five-set match. Since the strongest teams in men's volleyball at the time belonged to the Eastern Bloc, the American-led boycott of the 1980 Summer Olympics did not have as great an effect on these events as it had on the women's. The U.S.S.R. collected their third Olympic Gold Medal in men's volleyball with a 3-1 victory over Bulgaria (the Soviet women won that year as well, their third gold as well). With the U.S.S.R. boycotting the 1984 Olympic Games in Los Angeles, the U.S. was able to sweep Brazil in the finals to win the men's gold medal. Italy won its first medal (bronze in the men's competition) in 1984, foreshadowing a rise in prominence for their volleyball teams.
At the 1988 Games, Karch Kiraly and Steve Timmons led the U.S. men's team to a second straight gold medal. In 1992, underrated Brazil upset favourites C.I.S., Netherlands, and Italy in the men's competition for the country's first Olympic gold medal. Runner-up Netherlands, men's silver medalist in 1992, came back under team leaders Ron Zwerver and Olof van der Meulen in the 1996 Games for a five-set win over Italy. A men's bronze medalist in 1996, Serbia and Montenegro (playing in 1996 and 2000 as the Federal Republic of Yugoslavia) beat Russia in the gold medal match in 2000, winning their first gold medal ever. In 2004, Brazil won its second men's volleyball gold medal beating Italy in the finals. In the 2008 Games, the USA beat Brazil in the men's volleyball final.
See also: Volleyball in the United States and Volleyball in Canada
Rules of the game


Volleyball court
The court
The game is played on a volleyball court 18 meters (59 feet) long and 9 meters (29.5 feet) wide, divided into two 9 m × 9 m halves by a one-meter (40-inch) wide net placed so that the top of the net is 2.43 meters (7 feet 11 5/8 inches) above the center of the court for men's competition, and 2.24 meters (7 feet 4 1/8 inches) for women's competition (these heights are varied for veterans and junior competitions).
There is a line 3 meters from and parallel to the net in each team court which is considered the "attack line". This "3 meter" (or 10 foot) line divides the court into "back row" and "front row" areas (also back court and front court). These are in turn divided into 3 areas each: these are numbered as follows, starting from area "1", which is the position of the serving player:

After a team gains the serve (also known as siding out), its members must rotate in a clockwise direction, with the player previously in area "2" moving to area "1" and so on, with the player from area "1" moving to area "6".
The team courts are surrounded by an area called the free zone which is a minimum of 3 meters wide and which the players may enter and play within after the service of the ball.[9] All lines denoting the boundaries of the team court and the attack zone are drawn or painted within the dimensions of the area and are therefore a part of the court or zone. If a ball comes in contact with the line, the ball is considered to be "in". An antenna is placed on each side of the net perpendicular to the sideline and is a vertical extension of the side boundary of the court. A ball passing over the net must pass completely between the antennae (or their theoretical extensions to the ceiling) without contacting them.
The ball
Main article: Volleyball (ball)
FIVB regulations state that the ball must be spherical, made of leather or synthetic leather, have a circumference of 65–67 cm, a weight of 260–280 g and an inside pressure of 0.30–0.325 kg/cm2.[10] Other governing bodies have similar regulations.
Game play
Each team consists of six players. To get play started, a team is chosen to serve by coin toss. A player from the serving team throws the ball into the air and attempts to hit the ball so it passes over the net on a course such that it will land in the opposing team's court (the serve). The opposing team must use a combination of no more than three contacts with the volleyball to return the ball to the opponent's side of the net. These contacts usually consist first of the bump or pass so that the ball's trajectory is aimed towards the player designated as the setter; second of the set (usually an over-hand pass using wrists to push finger-tips at the ball) by the setter so that the ball's trajectory is aimed towards a spot where one of the players designated as an attacker can hit it, and third by the attacker who spikes (jumping, raising one arm above the head and hitting the ball so it will move quickly down to the ground on the opponent's court) to return the ball over the net. The team with possession of the ball that is trying to attack the ball as described is said to be on offense.
The team on defense attempts to prevent the attacker from directing the ball into their court: players at the net jump and reach above the top (and if possible, across the plane) of the net in order to block the attacked ball. If the ball is hit around, above, or through the block, the defensive players arranged in the rest of the court attempt to control the ball with a dig (usually a fore-arm pass of a hard-driven ball). After a successful dig, the team transitions to offense.
The game continues in this manner, rallying back and forth, until the ball touches the court within the boundaries or until an error is made. The most frequent errors that are made are either to fail to return the ball over the net within the allowed three touches, or to cause the ball to land outside the court. A ball is "in" if any part of it touches a sideline or end-line, and a strong spike may compress the ball enough when it lands that a ball which at first appears to be going out may actually be in. Players may travel well outside the court to play a ball that has gone over a sideline or end-line in the air.
Other common errors include a player touching the ball twice in succession, a player "catching" the ball, a player touching the net while attempting to play the ball, or a player penetrating under the net into the opponent's court. There are a large number of other errors specified in the rules, although most of them are infrequent occurrences. These errors include back-row or libero players spiking the ball or blocking (back-row players may spike the ball if they jump from behind the attack line), players not being in the correct position when the ball is served, attacking the serve in the front court and above the height of the net, using another player as a source of support to reach the ball, stepping over the back boundary line when serving, taking more than 8 seconds to serve,[11] or playing the ball when it is above the opponent's court.
scoring
When the ball contacts the floor within the court boundaries or an error is made, the team that did not make the error is awarded a point, whether they served the ball or not. The team that won the point serves for the next point. If the team that won the point served in the previous point, the same player serves again. If the team that won the point did not serve the previous point, the players of the team rotate their position on the court in a clockwise manner. The game continues, with the first team to score 25 points (and be two points ahead) awarded the set. Matches are best-of-five sets and the fifth set (if necessary) is usually played to 15 points. (Scoring differs between leagues, tournaments, and levels; high schools sometimes play best-of-three to 25; in the NCAA games are played best-of-five to 25 as of the 2008 season.)[12]
Before 1999, points could be scored only when a team had the serve (side-out scoring) and all sets went up to only 15 points. The FIVB changed the rules in 1999 (with the changes being compulsory in 2000) to use the current scoring system (formerly known as rally point system), primarily to make the length of the match more predictable and to make the game more spectator- and television-friendly.
Libero
In 1998 the libero player was introduced internationally, the term meaning free in Italian is pronounced LEE-beh-ro (although many players and coaches pronounce it lih-BEAR-oh). The NCAA introduced the libero in 2002.[13] The libero is a player specialized in defensive skills: the libero must wear a contrasting jersey color from his or her teammates and cannot block or attack the ball when it is entirely above net height. When the ball is not in play, the libero can replace any back-row player, without prior notice to the officials. This replacement does not count against the substitution limit each team is allowed per set, although the libero may be replaced only by the player whom they replaced.
The libero may function as a setter only under certain restrictions. If she/he makes an overhand set, she/he must be standing behind (and not stepping on) the 3-meter line; otherwise, the ball cannot be attacked above the net in front of the 3-meter line. An underhand pass is allowed from any part of the court.
The libero is, generally, the most skilled defensive player on the team. There is also a libero tracking sheet, where the referees or officiating team must keep track of who the libero subs in and out for. There may only be one libero per set (game), although there may be a different libero in the beginning of any new set (game).
Furthermore, a libero is not allowed to serve, according to international rules, with the exception of the NCAA women's volleyball games, where a 2004 rule change allows the libero to serve, but only in a specific rotation. That is, the libero can only serve for one person, not for all of the people for whom she goes in. That rule change was also applied to high school and junior high play soon after.
Recent rule changes
Other rule changes enacted in 2000 include allowing serves in which the ball touches the net, as long as it goes over the net into the opponents' court. Also, the service area was expanded to allow players to serve from anywhere behind the end line but still within the theoretical extension of the sidelines. Other changes were made to lighten up calls on faults for carries and double-touches, such as allowing multiple contacts by a single player ("double-hits") on a team's first contact provided that they are a part of a single play on the ball.
In 2008, the NCAA changed the minimum number of points needed to win any of the first four sets from 30 to 25 for women's volleyball (men's volleyball remained at 30.) If a fifth (deciding) set is reached, the minimum required score remains at 15. In addition, the word "game" is now referred to as "set".[12]
Changes in rules have been studied and announced by FIVB in recent years, and they have released the updated rules in 2009.[14]
Skills
Competitive teams master six basic skills: serve, pass, set, attack, block and dig. Each of these skills comprises a number of specific techniques that have been introduced over the years and are now considered standard practice in high-level volleyball.
Serve


Setting up for an overhand serve.


A man making a jump serve.
A player stands behind the inline and serves the ball, in an attempt to drive it into the opponent's court. His or her main objective is to make it land inside the court; it is also desirable to set the ball's direction, speed and acceleration so that it becomes difficult for the receiver to handle it properly. A serve is called an "ace" when the ball lands directly onto the court or travels outside the court after being touched by an opponent.
In contemporary volleyball, many types of serves are employed:
Underhand and Overhand Serve: refers to whether the player strikes the ball from below, at waist level, or first tosses the ball in the air and then hits it above shoulder level. Underhand serve is considered very easy to receive and is rarely employed in high-level competitions.
Sky Ball Serve: a specific type of underhand serve occasionally used in beach volleyball, where the ball is hit so high it comes down almost in a straight line. This serve was invented and employed almost exclusively by the Brazilian team in the early 1980s and is now considered outdated. In Brazil, this serve is called Jornada nas Estrelas (Star Trek).
Line and Cross-Court Serve: refers to whether the ball flies in a straight trajectory parallel to the side lines, or crosses through the court in an angle.
Top Spin: an overhand serve where the ball gains topspin through wrist snapping. This spin causes the ball to drop faster than it appears to a passer receiving it.
Floater: an overhand serve where the ball is hit with no spin so that its path becomes unpredictable. This type of serve can be administered while jumping or standing. This is akin to a knuckleball in baseball.
Jump Serve: an overhand serve where the ball is first tossed high in the air, then the player makes a timed approach and jumps to make contact with the ball. There is usually much topspin imparted on the ball. This is the most popular serve amongst college and professional teams.
Jump Float: This is a serve like the jump serve and the floater. The ball is tossed lower than a topspin jump serve, but contact is still made while in the air. This serve is becoming more popular amongst college and professional players because it has a certain unpredictability in its flight pattern.
Round-House Serve: the player stands with one shoulder facing the net, tosses the ball high and hits it with a fast circular movement of the arm. The ball is hit with the palm of the hand, creating a lot of topspin.
Hybrid Serve: An overhand serve delivered similarly to a top spin serve; however, it has more pace than a floater, but has a similar unpredictable path.
Pass


A woman making a forearm pass or bump.
Also called reception, the pass is the attempt by a team to properly handle the opponent's serve, or any form of attack. Proper handling includes not only preventing the ball from touching the court, but also making it reach the position where the setter is standing quickly and precisely.
The skill of passing involves fundamentally two specific techniques: underarm pass, or bump, where the ball touches the inside part of the joined forearms or platform, at waist line; and overhand pass, where it is handled with the fingertips, like a set, above the head. Either form (joined forearm or overhand pass) are acceptable in professional and beach volleyball, however there are much tighter regulations on the overhand pass in beach volleyball.
Set
The set is usually the second contact that a team makes with the ball. The main goal of setting is to put the ball in the air in such a way that it can be driven by an attack into the opponent's court. The setter coordinates the offensive movements of a team, and is the player who ultimately decides which player will actually attack the ball.
As with passing, one may distinguish between an overhand and a bump set. Since the former allows for more control over the speed and direction of the ball, the bump is used only when the ball is so low it cannot be properly handled with fingertips, or in beach volleyball where rules regulating overhand setting are more stringent. In the case of a set, one also speaks of a front or back set, meaning whether the ball is passed in the direction the setter is facing or behind the setter. There is also a jump set that is used when the ball is too close to the net. In this case the setter usually jumps off his or her right foot straight up to avoid going into the net. The setter usually stands about ⅔ of the way from the left to the right of the net and faces the left (the larger portion of net that he or she can see).
Sometimes a setter refrains from raising the ball for a teammate to perform an attack and tries to play it directly onto the opponent's court. This movement is called a "dump".[15] The most common dumps are to 'throw' the ball behind the setter or in front of the setter to zones 2 and 4. More experienced setters toss the ball into the deep corners or spike the ball on the second hit.
Attack
The attack (or spike, the slang term) is usually the third contact a team makes with the ball. The object of attacking is to handle the ball so that it lands on the opponent's court and cannot be defended. A player makes a series of steps (the "approach"), jumps, and swings at the ball.
Ideally the contact with the ball is made at the apex of the hitter's jump. At the moment of contact, the hitter's arm is fully extended above his or her head and slightly forward, making the highest possible contact while maintaining the ability to deliver a powerful hit. The hitter uses arm swing, wrist snap, and a rapid forward contraction of the entire body to drive the ball. A 'bounce' is a slang term for a very hard/loud spike that follows an almost straight trajectory steeply downward into the opponent's court and bounces very high into the air. A "kill" is the slang term for an attack that is not returned by the other team thus resulting in a point.
Contemporary volleyball comprises a number of attacking techniques:
Backcourt (or backrow)/pipe attack: an attack performed by a back row player. The player must jump from behind the 3-meter line before making contact with the ball, but may land in front of the 3-meter line.
Line and Cross-court Shot: refers to whether the ball flies in a straight trajectory parallel to the side lines, or crosses through the court in an angle. A cross-court shot with a very pronounced angle, resulting in the ball landing near the 3-meter line, is called a cut shot.
Dip/Dink/Tip/Cheat: the player does not try to make a hit, but touches the ball lightly, so that it lands on an area of the opponent's court that is not being covered by the defense.
Tool/Wipe/Block-abuse: the player does not try to make a hard spike, but hits the ball so that it touches the opponent's block and then bounces off-court.
Off-speed hit: the player does not hit the ball hard, reducing its speed and thus confusing the opponent's defense.
Quick hit/"One": an attack (usually by the middle blocker) where the approach and jump begin before the setter contacts the ball. The set (called a "quick set") is placed only slightly above the net and the ball is struck by the hitter almost immediately after leaving the setter's hands. Quick attacks are often effective because they isolate the middle blocker to be the only blocker on the hit.
Slide: a variation of the quick hit that uses a low back set. The middle hitter steps around the setter and hits from behind him or her.
Double quick hit/"Stack"/"Tandem": a variation of quick hit where two hitters, one in front and one behind the setter or both in front of the setter, jump to perform a quick hit at the same time. It can be used to deceive opposite blockers and free a fourth hitter attacking from backcourt, maybe without block at all.
Block


3 players performing a block
Blocking refers to the actions taken by players standing at the net to stop or alter an opponent's attack.
A block that is aimed at completely stopping an attack, thus making the ball remain in the opponent's court, is called offensive. A well-executed offensive block is performed by jumping and reaching to penetrate with one's arms and hands over the net and into the opponent's area. It requires anticipating the direction the ball will go once the attack takes place. It may also require calculating the best foot work to executing the "perfect" block.
The jump should be timed so as to intercept the ball's trajectory prior to it crossing over the net. Palms are held deflected downward about 45-60 degrees toward the interior of the opponents court. A "roof" is a spectacular offensive block that redirects the power and speed of the attack straight down to the attacker's floor, as if the attacker hit the ball into the underside of a peaked house roof.
By contrast, it is called a defensive, or "soft" block if the goal is to control and deflect the hard-driven ball up so that it slows down and becomes more easy to be defended. A well-executed soft-block is performed by jumping and placing one's hands above the net with no penetration into the opponent's court and with the palms up and fingers pointing backward.
Blocking is also classified according to the number of players involved. Thus, one may speak of single (or solo), double, or triple block.
Successful blocking does not always result in a "roof" and many times does not even touch the ball. While it’s obvious that a block was a success when the attacker is roofed, a block that consistently forces the attacker away from his or her 'power' or preferred attack into a more easily controlled shot by the defense is also a highly successful block.
At the same time, the block position influences the positions where other defenders place themselves while opponent hitters are spiking.
Dig


Woman going for a dig.
Digging is the ability to prevent the ball from touching one's court after a spike or attack, particularly a ball that is nearly touching the ground. In many aspects, this skill is similar to passing, or bumping: overhand dig and bump are also used to distinguish between defensive actions taken with fingertips or with joined arms.
Some specific techniques are more common in digging than in passing. A player may sometimes perform a "dive", i.e., throw his or her body in the air with a forward movement in an attempt to save the ball, and land on his or her chest. When the player also slides his or her hand under a ball that is almost touching the court, this is called a "pancake". The pancake is frequently used in indoor volleyball.
Sometimes a player may also be forced to drop his or her body quickly to the floor in order to save the ball. In this situation, the player makes use of a specific rolling technique to minimize the chances of injuries.
Coaching
Basic
Coaching for volleyball can be classified under two main categories: match coaching and developmental coaching. The objective of match coaching is to win a match by managing a team's strategy. Developmental coaching emphasizes player development through the reinforcement of basic skills during exercises known as "drills." Drills promote repetition and refinement of volleyball movements, particularly in footwork patterns, body positioning relative to others, and ball contact. A coach will construct drills that simulate match situations thereby encouraging speed of movement, anticipation, timing, communication, and team-work. At the various stages of a player's career, a coach will tailor drills to meet the strategic requirements of the team. The American Volleyball Coaches Association is the largest organization in the world dedicated exclusively to volleyball coaching.
Strategy


An image from an international match between Italy and Russia in 2005. A Russian player on the left has just served, with three men of his team next to the net moving to their assigned block positions from the starting ones. Two others, in the back-row positions, are preparing for defense. Italy, on the right, has three men in a line, each preparing to pass if the ball reaches him. The setter is waiting for their pass while the middle hitter with no. 10 will jump for a quick hit if the pass is good enough. Alessandro Fei (no. 14) has no passing duties and is preparing for a back-row hit on the right side of the field. Note the two liberos with different color dress. Middle hitters/blockers are commonly substituted by liberos in their back-row positions.
Player specialization
There are 5 positions filled on every volleyball team at the elite level. Setter, Outside Hitter/Left Side Hitter, Middle Hitter, Opposite Hitter/Right Side Hitter and Libero/Defensive Specialist. Each of these positions plays a specific, key role in winning a volleyball match.
Setters have the task for orchestrating the offense of the team. They aim for second touch and their main responsibility is to place the ball in the air where the attackers can place the ball into the opponents' court for a point. They have to be able to operate with the hitters, manage the tempo of their side of the court and choose the right attackers to set. Setters need to have swift and skillful appraisal and tactical accuracy, and must be quick at moving around the court.
Liberos are defensive players who are responsible for receiving the attack or serve. They are usually the players on the court with the quickest reaction time and best passing skills. Libero means 'free' as they have the ability to substitute for any other player on the court during each play. They do not necessarily need to be tall, as they never play at the net, which allows shorter players with strong passing and defensive skills to excel in the position and play an important role in the team's success. A player designated as a libero for a match may not play other roles during that match. Liberos wear a different color jersey than their teammates.
Middle blockers or Middle hitters are players that can perform very fast attacks that usually take place near the setter. They are specialized in blocking, since they must attempt to stop equally fast plays from their opponents and then quickly set up a double block at the sides of the court. In non-beginners play, every team will have two middle hitters.
Outside hitters or Left side hitters attack from near the left antenna. The outside hitter is usually the most consistent hitter on the team and gets the most sets. Inaccurate first passes usually result in a set to the outside hitter rather than middle or opposite. Since most sets to the outside are high, the outside hitter may take a longer approach, always starting from outside the court sideline. In non-beginners play, there are again two outside hitters on every team in every match.
Opposite hitters or Right side hitters carry the defensive workload for a volleyball team in the front row. Their primary responsibilities are to put up a well formed block against the opponents Outside Hitters and serve as a backup setter. Sets to the opposite usually go to the right side of the antennae.
Formations
The three standard volleyball formations are known as "4-2", "6-2" and "5-1", which refers to the number of hitters and setters respectively. 4-2 is a basic formation used only in beginners' play, while 5-1 is by far the most common formation in high-level play.
4-2
The 4-2 formation has four hitters and two setters. The setters usually set from the middle front or right front position. The team will therefore have two front-row attackers at all times. In the international 4-2, the setters set from the right front position. The international 4-2 translates more easily into other forms of offense.
The setters line up opposite each other in the rotation. The typical lineup has two outside hitters. By aligning like positions opposite themselves in the rotation, there will always be one of each position in the front and back rows. After service, the players in the front row move into their assigned positions, so that the setter is always in middle front. Alternatively, the setter moves into the right front and has both a middle and an outside attacker; the disadvantage here lies in the lack of an offside hitter, allowing one of the other team's blockers to "cheat in" on a middle block.
The clear disadvantage to this offensive formation is that there are only two attackers, leaving a team with fewer offensive weapons.
Another aspect is to see the setter as an attacking force, albeit a weakened force, because when the setter is in the front court they are able to 'tip' or 'dump', so when the ball is close to the net on the second touch, the setter may opt to hit the ball over with one hand. This means that the blocker who would otherwise not have to block the setter is engaged and may allow one of the hitters to have an easier attack.
6-2
In the 6-2 formation, a player always comes forward from the back row to set. The three front row players are all in attacking positions. Thus, all six players act as hitters at one time or another, while two can act as setters. So the 6-2 formation is actually a 4-2 system, but the back-row setter penetrates to set.
The 6-2 lineup thus requires two setters, who line up opposite to each other in the rotation. In addition to the setters, a typical lineup will have two middle hitters and two outside hitters. By aligning like positions opposite themselves in the rotation, there will always be one of each position in the front and back rows. After service, the players in the front row move into their assigned positions.
The advantage of the 6-2 is that there are always three front-row hitters available, maximizing the offensive possibilities. However, not only does the 6-2 require a team to possess two people capable of performing the highly specialized role of setter, it also requires both of those players to be effective offensive hitters when not in the setter position. At the international level, only the Cuban National Women's Team employs this kind of formation. It is also used in Women's NCAA play, partially due to the variant rules used which allow 12[16] substitutions per set (as opposed to the 6 allowed in the standard rules).
5-1
The 5-1 formation has only one player who assumes setting responsibilities regardless of his or her position in the rotation. The team will therefore have three front-row attackers when the setter is in the back row, and only two when the setter is in the front row, for a total of five possible attackers.
The player opposite the setter in a 5-1 rotation is called the opposite hitter. In general, opposite hitters do not pass; they stand behind their teammates when the opponent is serving. The opposite hitter may be used as a third attack option (back-row attack) when the setter is in the front row: this is the normal option used to increase the attack capabilities of modern volleyball teams. Normally the opposite hitter is the most technical skilled hitter of the team. Back-row attacks generally come from the back-right position (position 1), but are increasingly performed from back-center in high-level play.
The big advantage of this system is that the setter always has 3 hitters to vary sets with. If the setter does this well, the opponent's middle blocker may not have enough time to block with the outside hitter, increasing the chance for the attacking team to make a point.
There is another advantage: when the setter is a front-row player, he or she is allowed to jump and "dump" the ball onto the opponent's side. This too can confuse the opponent's blocking players: the setter can jump and dump or can set to one of the hitters. A good setter knows this and thus won't only jump to dump or to set for a quick hit, but as well to confuse the opponent.
The 5-1 offense is actually a mix of 6-2 and 4-2: when the setter is in the front row, the offense looks like a 4-2; when the setter is in the back row, the offense looks like a 6-2

swimming

Swimming (sport)
.
Swimming

The aquatic sport of swimming is based on the human act of swimming, that is, locomotion in water by self propulsion, usually with the goal to complete a given distance in the smallest time. There are also swimming competitions based on endurance or precedence rather than speed, such as crossing the English Channel or some other stretch of open water. As a sport, swimming is usually distinguished from other aquatic sports (such as diving, synchronized swimming and water polo) that involve the act of swimming but where the goal is neither speed nor endurance.
Swimming has been part of the modern Olympic Games since their inception in 1896, and is governed by the Fédération Internationale de Natation (FINA). The belief is widely held that swimming is the best aerobic exercise in the world.
History
Main article: History of swimming
Competitive swimming in Europe started around 1800, mostly using breaststroke. In 1873 John Arthur Trudgen introduced the trudgen to Western swimming competitions, after copying the front crawl used by Native Americans. Due to a British disregard for splashing, Trudgen employed a scissor kick instead of the front crawl's flutter kick. Swimming was part of the first modern Olympic games in 1896 in Athens. In 1902 Richard Cavill introduced the front crawl to the Western world. In 1908, the world swimming association, Fédération Internationale de Natation (FINA), was formed. The butterfly stroke was developed in the 1930s and was at first a variant of breaststroke, until it was accepted as a separate style in 1952.




Modalities
There are many modalities of swimming competitions, distinguished mainly by the swimming strokes that are allowed, including
Butterfly or fly: the course must be completed entirely in the butterfly style, in which the swimmer brings his or her arms near full extension and releases at the waist. While the swimmer's arms are at full extension the breath is to be taken as the arms pull down. As the swimmer release the water past their hips, they bring their arms up and out into the recovery while the head goes back down. "Dolphin kicking" (undulating) with both feet together in sequence with two kicks per arm stroke. Usually there is a kick while the hands are at full extension and then one at the recovery when the hands are at their hips. All end walls must be touched with two hands, and the swimmer will be disqualified if his/her arms do not clear the water at the same time. Typical distances include 25(8&U), 50, 100, 200.
Backstroke or back: competitors must swim in the backstroke style, which is similar to the front crawl, except on your back. Kicking is done by alternating both feet continuously and pulling each arm one at a time and keeping arms straight above the water, and looking straight down. At the end walls, flip turns are permitted (the swimmer is to turn on to his/her front before performing the turn and this turn is the same as a front crawl once on your stomach), and a two-hand touch is not necessary. Typical distances include 25(8&U), 50, 100, 200.
Breaststroke or breast: competitors must swim in the breaststroke style, where the swimmer kicks legs out (much like a frog, but more whip like and with the knees staying closely together), scoops the water in towards the chest with his or her hands and then while the hands are together, thrusts the hands out in front just before the kick is repeated. The breath is started as the hands pull the water from full extension and then put back down as the arms thrust forward. One underwater "pull-out" is permitted for the start and after every end wall, with, in order: streamline glide, one fully extended pull with one dolphin kick that is not required, but must be timed precisely with pull), one breaststroke kick while bringing the hands back forward. This pullout is done under water without a breath. The two hands must touch the wall simultaneously at every turn like in the butterfly modality. After the 2004 Olympics in Athens, Greece, thanks to Kosuke Kitajima, there was an adjustment made to the underwater "pull-out". The new rule states that you can also do a single downward dolphin kick (upward is not permitted). Kosuke Kitajima was the first breaststroke swimmer to perform such "pull-out". Typical distances include 25(8&U), 50, 100, 200.
Freestyle of free: competitors are free to use any stroke they wish. Most select the front crawl, as it is both the fastest and most efficient. The front crawl is where the swimmer breathes to the side with typically one ear staying in the water, kicks by alternating both legs, and pulls with each arm moving in an alternating fashion. Flip/tumble turns are legal and are most common. Variants include free relays, in which four team members each swim an equal distance of freestyle; when one member touches the end wall, the next dives off the block. Typical distances are 25(8&U), 50, 100, 200, 400, 500, 800, 1000, 1500, and 1650.
Individual medley or IM: each swimmer must complete one quarter of the full distance in each of the three competition styles (butterfly, backstroke, breaststroke) and one part in free style. Open turns are required in the switch from one style to another, but flip turns or bucket turns can be made during a backstroke and freestyle flip turn where the next stoke is the same as the previous one. Each part must be completed in its style before moving on to the next style. Variations include medley relays, in which four team members each swim one part (in the order backstroke, breaststroke, butterfly, and free). The full distance is typically 100, 200, 400, or 800 units.
At the end walls, the following turns may be permitted, depending on the modality and swimming style:
Open turn: is where the swimming touches the wall, not grabbing and brings legs to the wall to push off. Fly and breast must touch with two hands, then one arm is typically dropped while the other comes past the head to meet the other arm in a streamline.
Flip turn or tumble turn: the swimmer swims to the end wall, tucks, does a forward flip, and pushes off in streamline. This is only legal in backstroke and freestyle modalities.
Backwards flip turn or bucket turn: swimmers must touch the end wall on their back and come out on their front. This is typically done by taking one front stroke into the wall before doing a front flip and pushing off on the back in streamline
Competition
The goal of competitive swimming is usually to have the fastest time to complete a given distance. Competitive swimming became popular in the nineteenth century.
Swimming is an event at the Summer Olympic Games, where male and female athletes compete in 13 of the recognized events each. Olympic events are held in a 50 meter pool(long course). There are 36 officially recognized individual swimming events – 18 male events and 18 female events, however the International Olympic Committee only recognizes 34 of them – 17 male and 17 female. The international governing body for competitive swimming's is the Fédération Internationale de Natation ("International Swimming Federation") better known as FINA.
Competition pools
Most swimming sport events are held in special competition swimming pools, which are either long course pools such as used in the Olympic Games (50 m) or short course pools as was used in the Manchester World Swimming Championships (25 yards or 25 m). Competition pools have foot rests from which the competitor can dive in, and possibly also touch-sensitive pads to electronically record the swimming time of each competitor.

Seasons
Club swimming in the US has two major seasons. During the short-course season, swimmers swim in 25 yard pools. This season lasts from September to the end of March. The long-course season, is swum in 50 meter Olympic pools and lasts from April to the end of August.
Officials
There are several types of officials[1]:
A starter sends the swimmers off the blocks and may call a false start if a swimmer leaves the block before the starter sends them;
Finish judges determine the order of finish and make sure the swimmers finish in accordance with the rules (two hands simultaneously for breaststroke and butterfly, on the back for backstroke, etc.)
Turn judges check that the swimmers' turns are within rules;
Stroke judges check the swimmers' strokes;
Timekeepers time the swimmers' swims;
The referee takes overall responsibility for running the race and makes the final decisions as to who wins the competition.
If an official catches a swimmer breaking a rule concerning the stroke he or she is swimming, that swimmer is said to be disqualified (commonly referred to as a "DQ") and the swim is not considered valid.
Meet Setup
A meet consists of a number of events classified by age, gender, distance, and stroke. For example, Event 1: Girls 8&U 25 fly. Each event has a certain amount of heats. A heat is a group of people who swim at the same time, on per lane, yet compete against all entries in that event. Most meets do one stroke at one time. All fly, back, breast, free, IM, and relay. Example: Fly:25, 50, 100, 200. Back: 25, 50, 100, 200. Breast: 25, 50, 100, 200. Free: 25, 50, 100, 200, 400, 800, 1000, 1500, 1650. IM: 100, 200, 400. Relays: 100, 200, 400, 800. A heat sheet tells a swimmer what he or she will swim, what heat, and what lane. A psych sheet tells the entry position of the swimmer before the start of the meet. Larger meets, which are not national or international competitions, typically cover a three day period; Friday, Saturday, and Sunday. Friday: distance events(400 free and up and the 400 IM). Saturday: Half of the events and, most likely, free relays. Sunday: the remainder of the events and the other relays. In typical meets swimmers are placed after swimming once in their heat, timed finals. In championship meets (international, national, state, regionals, district, and collegiate) and some other meets, the swimmers compete in preliminaries, sometimes semi-finals, and are placed after finals. Sometimes swimmers can enter time trials at a meet, to obtain new official time, but time trials results are not included in the official placing of the particular event at the meet.
Swimwear
Main article: Competitive swimwear
Main article: Swimsuit
"Team colors" would be referred to as the "team suit and cap"Suit The suit covers the skin for modesty Competitive swimwear seeks to improve upon bare human skin for a speed advantage. For extra speed a swimmer wears a body suit, which has rubber or plastic bumps that break up the water close to the body and provides a small amount of thrust—just barely enough to help a swimmer swim faster.Swim Cap A swim cap(a.k.a. cap)keeps the swimmers hair out of the way to reduce drag. During practice, many female swimmers wear caps with different sayings, patterns or both. Latex Caps is made of latex which sticks to anything. If you are having trouble putting on this type of cap or removing it, try putting water on the cap, place your hands on you forehead with your cap between your fingers and forehead, then have someone pull the back of the cap over your head. This is easy to tell by both how it looks, and how it feels.Silicone Caps This cap is very stretchy, yet is snug. If you are having trouble putting this cap on, place both hands in the cap, stretch the cap out, place your head down in the front of the cap, and pull it back, over your head, and pull your hands out. Tuck any loose hair back in. Lycra Cap This is a type of cap that does not pull on your hair like latex caps. However, it is not as snug as silicone. Serious competitive swimmers normally do not use Lycra Caps because they produce a lot of drag.Goggles Goggles keep water and chlorine out of swimmers eyes. Prescription goggles can help those that need glasses. If you have contacts, you should find ones that are a more dependable to prevent protein build-up in your eyes (including starts). Goggles with a tint may help protect your eyes from damage or burns and are handy for outdoor swimming.
Brands include: Arena, Speedo, TYR, Nike, Dolfin (There are other brands of suits)
Regular practice and competition-swimwear
Men
Men's most used practice swimwear include speedos (briefs) and jammers. As of New Year's Day 2010, men are only allowed to wear suits from waist to above the knees. They are also only permitted to wear one piece of swimwear; they cannot wear speedos underneath jammers. This law was enacted after the controversy in the Beijing Olympics and Rome World Championships.
Women
Women wear one piece suits with different backs for competition, though there are two-piece suits that can be worn to compete as well. Backs vary mainly in strap thickness and geometric design. Most common styles include: racerback, axel back, corset, diamondback, and butterfly-back. There are also different style lengths: three quarter length (reaches the knees), regular length (shoulders to hips), and bikini style (2 piece). Also as of New Year's 2010, in competition, women are only allowed to wear suits that do not go past the knees or shoulders.
Drag suits
Drag suits are used for increasing the resistance against the swimmer in order to help adjust the swimmer to drag. This way when swimmers switch back normal practice suits they swim faster as a result of feeling less resistance. They are not normally worn during competitions.
Drag shorts
Drag shorts like drag suits are worn in training and are also used to increase drag so that when taken off in racing it feels easier and the wearer feels less resistance. Other forms of drag wear include nylons, and t-shirts; the point is to increase friction in the water to build strength during training, and increase speed once drag items are removed for competition. It is also very common for swimmers to shave areas of exposed skin, to reduce friction in the water. Drag wear is not normally worn during competitions.
Open water swimming
Main article: Open water swimming
Open water swimming is swimming outside of a regular pool, usually in a lake, or sometimes ocean.
Changes to the sport
Swimming times have dropped over the years due to better training techniques and to new developments.
The first four Olympics competitions were not held in pools, but in open water (1896- The Mediterranean, 1900- The Seine River, 1904- an artificial lake, 1906- The Mediterranean). The 1904 Olympics' freestyle race was the only one ever measured at 100 yards, instead of the usual 100 meters. A 100 meter pool was built for the 1908 Olympics and sat in the center of the main stadium's track and field oval. The 1912 Olympics, held in the Stockholm harbor, marked the beginning of electronic timing.
Male swimmers wore full body suits until the 1940s, which caused more drag in the water than their modern swimwear counterparts did. Competition suits now include engineered fabric and designs to reduce swimmers' drag in the water and prevent athlete fatigue. In addition, over the years, pool designs have lessened the drag. Some design considerations allow for the reduction of swimming resistance, making the pool faster. Namely, proper pool depth, elimination of currents, increased lane width, energy absorbing racing lane lines and gutters, and the use of other innovative hydraulic, acoustic and illumination designs.
The 1924 Summer Olympics were the first to use the standard 50 meter pool with marked lanes. In the freestyle, swimmers originally dove from the pool walls, but diving blocks were incorporated at the 1936 Summer Olympics. The flip turn was developed by the 1950s and goggles were first used in the 1976 Olympics.
There were also changes in the late 20th century in terms of technique. Breaststrokers are now allowed to dip their head completely under water, which allowed for a longer stroke and faster time. However, the breaststrokers must bring their heads up at the completion of each cycle. In addition, a split stroke in the breaststroke start and turns has been added to help speed up the stroke. There have been some other changes added recently as well. Now off the start and turns, breaststrokers are allowed 1 butterfly kick to help increase their speed. Backstrokers are now allowed to turn on their stomachs before the wall in order to perform a "flip-turn". Previously, they had to reach and flip backwards, but this turn is now illegal in all backstroke races. However, a variation of it, known as a "bucket turn" is sometimes used in Individual Medley events to transition from backstroke to breaststroke.
Records in swimming
The foundation of FINA in 1908 signalled the commencement of recording the first official world records in swimming. At that time records could be established in any swimming pool of length not less than 25 yards, and records were also accepted for intermediate distance split times from longer distance events. The Danish swimmer Ranghild Hveger established forty-two records between 1936 and 1942 due to these rules.
Records in events such as 300 yd, 300 m, 1000 yd and 1000 m freestyle, 400 m backstroke, 400 m and 500 m breaststroke were no longer ratified from 1948. A further removal of the 500 yd and 500 m freestyle, 150 m backstroke and 3×100 m medley relay from the record listings occurred in 1952.
In 1952 the national federations of the United States and Japan proposed at the FINA Congress the separation of records achieved in long course and short course pools, however it was four more years for action to come into effect with Congress deciding to retain only records held in 50 m pools as the official world record listings.
By 1969 there were thirty-one events in which FINA recognised official world records – 16 for men, 15 for women – closely resembling the event schedule that was in use at the Olympic Games.
The increase in accuracy and reliability of electronic timing equipment led to the introduction of hundredths of a second to the time records from 21 August 1972.
Records in short course (25 m) pools began to be officially approved as "short course world records" from 3 March 1991. Prior to this "record" times were not officially recognised, but were regarded a "world best time" (WBT). From 31 October 1994 records in 50 m backstroke, breaststroke and butterfly records were added to the official record listings.
FINA currently recognises world records in the following events for both men and women.[2]
Freestyle: 50 m, 100 m, 200 m, 400 m, 800 m, 1500 m
Backstroke: 50 m, 100 m, 200 m
Breaststroke: 50 m, 100 m, 200 m
Butterfly: 50 m, 100 m, 200 m
Individual medley: 100 m (short course only), 200 m, 400 m
Relays: 4×100 m freestyle, 4×200 m freestyle, 4×100 m medley
Nutrition
In swimming it is recommended that you eat healthy, although carbohydrate are recommended for highly demanding sports due to the complete sources of energy that they provide.[3] As a result, many competitive swimmers eat carbohydrates and protein before their race. Furthermore, carbohydrate promote muscle stamina and strength because the breakdown product of carbohydrate-glucose is a primary source of energy for muscles during exercise.
Commonly the nutrient and energy needs of swimmers can be compromised by their intense schedules. Whereas time should be allowed for a light meal before swimming, and time for a well-balanced generous meal should be allotted after the workout.
Additionally, healthy snacking can at times, be more efficient in fueling the body than a main meal. For example, healthy snacking ideas include: low fat yogurt, fresh or dried fruit, crackers, oatmeal and raisins, granola, and cereal.
Like all aerobic sports, swimmers need to be sure they remain hydrated and drink an adequate amount.
Importance of carbohydrates
Nutrients are the "chemicals" supplying the body with energy. The presence of Vitamins, Minerals, and Water is required in order for the body to access the energy from carbohydrate, but doesn't supply energy in the form of calories.[4]
Carbohydrates are the substrate of choice for quick energy. They are not made up of fat. Exercising the body primarily receives energy from the "carbohydrate and fat." when the body is running low of carbohydrate and fat, then the body will start using "protein as an energy source." This will happen when "the total caloric intake is too low over a period of months, and/or exercise is so long the body's accessible sources of carbohydrate and protein become exhausted." Swimmers try their best to not let this happen.[4]
When warming-up or having an easy set at practice, the body has more than enough oxygen available to support the exercise. In addition, the body realizes it might need carbohydrate at a later time. When practice is rigorous or at a swimming competition, the body doesn’t have enough oxygen to run on. This is when the body finds energy in other ways that don’t require oxygen and will “choose to rely primarily on carbohydrate for its energy.”[4]
Therefore, the body will always use some carbohydrate and fat. The intensity of the swim will indicate which fuel source will take command of the others. As a result, “When swimming is easy, fat is the primary fuel source. When it is the toughest, carbohydrate is the primary source. When swimming is about 50% of maximum effort, carbohydrate and fat contribute about equally.[4]
Michael Phelps diet
Michael Phelps, who won 8 gold medals in the 2008 Summer Olympics, "eats roughly 12,000 calories a day."[5] Phelps eats about "4,000 calories every time he sits down to for a meal."[6] This comes from all the carbohydrate, protein and fat that a person eats. Phelps consume this many calories in a day, because "he needs all the calories in order to keep his energy levels high for the 17 times he will swim over the next 9 days of the Olympic Games."[7]
Phelps wakes up at 5 a.m. and starts his day off with a huge breakfast. Phelps breakfast menu consists of three fried egg sandwiches with cheese, lettuce, tomato, fried onions, and mayonnaise on white bread, a 5-egg omelet, a bowl of grits, three slices of French toast with powdered sugar, three chocolate-chip pancakes and two cups of coffee.[6]
When lunch time comes around, Phelps loads up on a pound of pasta and two large ham and cheese sandwiches with mayo on white bread. He also takes this opportunity to washing his lunch down with about 1,000 calories worth of energy drinks.[6]
Before the competition begins, Phelps sits down for dinner of another pound of pasta and an entire pizza. He once again takes this opportunity to wash his dinner down with another 1,000 calories worth of energy drinks.[6]
Even when Phelps is not competing, he still needs all the energy he can get with his rigorous five-hours-a-day, six-days-a-week workout regimen.[6]
Health and Skin Care
It's recommended that swimmers wear water proof sunscreen to meets and daytime swim practices that are outside to prevent sunburns.It's also recommended that swimmers dry off well between events at meets and change into dry clothes after practices and meets rather than wear his or her wet bathing suit home to prevent rashes and skin infections.
Swimmers should shower with mild soap after swimming to remove pool chemicals such as chlorine. Swimmers should use goggles to protect the eyes from pool water and improve underwater vision.[8][9]

tennis

Tennis is a sport usually played between two players (singles) or between two teams of two players each (doubles). Each player uses a racquet that is strung to strike a hollow rubber ball covered with felt past a net into the opponent's court.
The modern game of tennis originated in the United Kingdom in the late 19th century as "lawn tennis" which has heavy connections to various field/lawn games as well as to the ancient game of real tennis. After its creation, tennis spread throughout the upper-class English-speaking population before spreading around the world[1]. Tennis is an Olympic sport and is played at all levels of society at all ages. The sport can be played by anyone who can hold a racket, including people in wheelchairs.
The rules of tennis have not changed much since the 1890s. Two exceptions are that from 1908 to 1960 the server had to keep one foot on the ground at all times, and then the adoption of the tie-break in the 1970s. A recent addition to professional tennis has been the adoption of electronic review technology coupled with a point challenge system, which allows a player to challenge the line (or chair) umpire's call of a point.
Tennis enjoys millions of recreational players and is also a hugely popular worldwide spectator sport, especially the four Grand Slam tournaments (also referred to as the "Majors"): the Australian Open, the French Open, Wimbledon, and the US Open.
History
Main article: History of tennis
Harry Gem and his friend Augurio Perera developed a game that combined elements of rackets and the Basque ball game pelota, which they played on Perera's croquet lawn in Birmingham, United Kingdom.[2][3] In 1872, along with two local doctors, they founded the world's first tennis club in Leamington Spa.[4] The Courier of July 23, 1884 recorded one of the first tennis tournaments, held in the grounds of Shrubland Hall.[5]
In December 1873, Major Walter Clopton Wingfield designed and patented a similar game — which he called sphairistike (Greek: σφάίρίστική, from ancient Armenian meaning "skill at playing at ball"), and was soon known simply as "sticky" — for the amusement of his guests at a garden party on his estate of Nantclwyd, in Llanelidan, Wales.[6] He likely based his game on the evolving sport of outdoor tennis including real tennis. According to some tennis historians, modern tennis terminology also derives from this period, as Wingfield borrowed both the name and much of the French vocabulary of real tennis and applied them to his new game.[citation needed]


Lawn tennis in the U.S., 1887
The first championships at Wimbledon in London were played in 1877.[7] The first Championships culminated a significant debate on how to standardize the rules.
In America in 1874 Mary Ewing Outerbridge, a young socialite, returned from Bermuda where she met Major Wingfield. She laid out a tennis court at the Staten Island Cricket Club in New Brighton Staten Island, New York. The exact location of the club was under what is now the Staten Island Ferry terminal. The first American National tournament in 1880 was played there. An Englishman named O.E Woodhouse won the singles match. There was also a doubles match which was won by a local pair. There were different rules at each club. The ball in Boston was larger than the one normally used in NY. On May 21, 1881, the United States National Lawn Tennis Association (now the United States Tennis Association) was formed to standardize the rules and organize competitions.[8] The U.S. National Men's Singles Championship, now the US Open, was first held in 1881 at Newport, Rhode Island.[9] The U.S. National Women's Singles Championships were first held in 1887.[10] Tennis was also popular in France, where the French Open dates to 1891.[11] Thus, Wimbledon, the US Open, the French Open, and the Australian Open (dating to 1905) became and have remained the most prestigious events in tennis.[7][12] Together these four events are called the Majors or Slams (a term borrowed from bridge rather than baseball).[13]
The comprehensive International Lawn Tennis Federation, now known as the International Tennis Federation, rules promulgated in 1924 have remained remarkably stable in the ensuing eighty years, the one major change being the addition of the tie-break system designed by James Van Alen.[14] That same year, tennis withdrew from the Olympics after the 1924 Games but returned 60 years later as a 21-and-under demonstration event in 1984. This reinstatement was credited by the efforts by the then ITF President Philippe Chatrier, ITF General Secretary David Gray and ITF Vice President Pablo Llorens, and support from IOC President Juan Antonio Samaranch. The success of the event was overwhelming and the IOC decided to reintroduce tennis as a full medal sport at Seoul in 1988.
The Davis Cup, an annual competition between men's national teams, dates to 1900.[15] The analogous competition for women's national teams, the Fed Cup, was founded as the Federation Cup in 1963 to celebrate the 50th anniversary of the founding of the ITF.[16]
In 1926, promoter C.C. Pyle established the first professional tennis tour with a group of American and French tennis players playing exhibition matches to paying audiences.[12][17] The most notable of these early professionals were the American Vinnie Richards and the Frenchwoman Suzanne Lenglen.[12][18] Once a player turned pro he or she could not compete in the major (amateur) tournaments.[12]
In 1968, commercial pressures and rumors of some amateurs taking money under the table led to the abandonment of this distinction, inaugurating the open era, in which all players could compete in all tournaments, and top players were able to make their living from tennis.[19] With the beginning of the open era, the establishment of an international professional tennis circuit, and revenues from the sale of television rights, tennis's popularity has spread worldwide, and the sport has shed its upper/middle-class English-speaking image[20] (although it is acknowledged that this stereotype still exists).[20][21][22]
In 1954, Van Alen founded the International Tennis Hall of Fame, a non-profit museum in Newport, Rhode Island.[23] The building contains a large collection of tennis memorabilia as well as a hall of fame honoring prominent members and tennis players from all over the world. Each year, a grass-court tournament and an induction ceremony honoring new Hall of Fame members are hosted on its grounds.
Equipment
Main article: Tennis technology
Part of the appeal of tennis stems from the simplicity of equipment required for play. Beginners need only a racquet and balls.
Racquets
The tennis racquet comprises a handle and neck joining a roughly circular frame that holds an array of tightly pulled strings. For the first century of the modern game, racquets were of wood and of standard size, and strings were of animal gut. Laminated wood construction yielded more strength in racquets used through most of the 20th century until first metal and then composites of carbon graphite, ceramics, and lighter metals such as titanium were introduced. These stronger materials enabled the production of oversized rackets that yielded yet more power. Meanwhile technology led to the use of synthetic strings that match the feel of gut yet with added durability.
Balls
Main article: Tennis ball
Tennis balls are of hollow rubber with a felt coating. Traditionally white, the predominant color was gradually changed to Optic Yellow in the latter part of the twentieth century to allow for improved visibility.
Miscellaneous
Advanced players improve their performance through a number of accoutrements. Vibration dampers may be interlaced in the proximal part of the string array for improved feel. Racket handles may be customized with absorbent materials to improve the players' grip. Players often use sweat bands on their wrists to keep their hands dry as well. Finally, although the game can be played in a variety of shoes, specialized tennis shoes have wide, flat soles for stability and a built-up front structure to avoid excess wear.

Playing Manner
For individual terms see: Glossary of tennis
Court
Main article: Tennis court


The dimensions of a tennis court.
Tennis is played on a rectangular, flat surface, usually grass, clay, a hardcourt of concrete and/or asphalt and occasionally carpet (indoor). The court is 78 feet (23.77 m) long, and 27 feet (8.23 m) wide for singles matches and 36 ft (10.97 m) for doubles matches.[24] Additional clear space around the court is required in order for players to reach overrun balls. A net is stretched across the full width of the court, parallel with the baselines, dividing it into two equal ends. The net is 3 feet 6 inches (1.07 m) high at the posts and 3 feet (91.4 cm) high in the center.[24]
The modern tennis court owes its design to Major Walter Clopton Wingfield who, in 1873, patented a court much the same as the current one for his stické tennis (sphairistike). This template was modified in 1875 to the court design that exists today, with markings similar to Wingfield's version, but with the hourglass shape of his court changed to a rectangle.[25]
Lines
The lines that delineate the width of the court are called the baseline (farthest back) and the service line (middle of the court). The short mark in the center of each baseline is referred to as either the hash mark or the center mark. The outermost lines that make up the length are called the doubles sidelines. These are the boundaries used when doubles is being played. The lines to the inside of the doubles sidelines are the singles sidelines and are used as boundaries in singles play. The area between a doubles sideline and the nearest singles sideline is called the doubles alley, which is considered playable in doubles play. The line that runs across the center of a player's side of the court is called the service line because the serve must be delivered into the area between the service line and the net on the receiving side. Despite its name, this is not where a player legally stands when making a serve.[26] The line dividing the service line in two is called the center line or center service line. The boxes this center line creates are called the service boxes; depending on a player's position, he will have to hit the ball into one of these when serving.[27] A ball is out only if none of it has hit the line or the area inside the lines upon its first bounce. All the lines are required to be between 1 and 2 inches (51 mm) in width. The baseline can be up to 4 inches (100 mm) wide if so desired.[26]
Play of a single point
Main article: Point (tennis)


Two players before a serve.
The players (or teams) start on opposite sides of the net. One player is designated the server, and the opposing player is the receiver. Service alternates game by game between the two players (or teams.) For each point, the server starts behind his baseline, between the center mark and the sideline. The receiver may start anywhere on their side of the net. When the receiver is ready, the server will serve, although the receiver must play to the pace of the server.
In a legal service, the ball travels past the net (without touching it) and into the diagonally opposite service box. If the ball hits the net but lands in the service box, this is a let or net service, which is void, and the server gets to retake that serve. The player can serve any number of let services in a point and they are always treated as voids and not as faults. A fault is a serve that falls long or wide of the service box, or does not clear the net. There is also a "foot fault", which occurs when a player's foot touches the baseline or an extension of the center mark[28] before the ball is hit. If the second service is also faulty, this is a double fault, and the receiver wins the point. However, if the serve is in, it is considered a legal service.
A legal service starts a rally, in which the players alternate hitting the ball across the net. A legal return consists of the player or team hitting the ball exactly once before it has bounced twice or hit any fixtures except the net, provided that it still falls in the server's court. The ball then travels back past the net and bounces in the court on the opposite side. The first player or team to fail to make a legal return loses the point.
Scoring
Main article: Tennis score
A tennis match is determined through the best of 3 or 5 sets. Typically for both men's and women's matches, the first player to win two sets wins the match. At certain important tennis tournaments for men, including all four Grand Slam tournaments and the final of the Olympic Games, the first man to win three sets wins the match.[29] A set consists of games, and games, in turn, consist of points.
A game consists of a sequence of points played with the same player serving. A game is won by the first player to have won at least four points in total and at least two points more than the opponent. The running score of each game is described in a manner peculiar to tennis: scores from zero to three points are described as "love", "fifteen", "thirty", and "forty" respectively. (See the main article Tennis score for the origin of these words as used in tennis.) If at least three points have been scored by each player, and the scores are equal, the score is "deuce". If at least three points have been scored by each side and a player has one more point than his opponent, the score of the game is "advantage" for the player in the lead. During informal games, "advantage" can also be called "ad in" or "ad out", depending on whether the serving player or receiving player is ahead, respectively.
In tournament play, the chair umpire calls the point count (e.g., "fifteen-love") after each point. The score of a tennis match during play is always read with the serving player's score first. After a match, the score is always read with the winning player's score first. At the end of a game, the chair umpire also announces the winner of the game and the overall score.
A game point occurs in tennis whenever the player who is in the lead in the game needs only one more point to win the game. The terminology is extended to sets (set point), matches (match point), and even championships (championship point). For example, if the player who is serving has a score of 40-love, the player has a triple game point (triple set point, etc.) as the player has three consecutive chances to win the game. Game points, set points, and match points are not part of official scoring and are not announced by the chair umpire in tournament play.
A break point occurs if the receiver, not the server, has a game point. Break points are of particular importance because serving is generally advantageous. A receiver who has two (score of 15-40) or three (score of love-40) consecutive chances to win the game has double break point or triple break point, respectively.
A set consists of a sequence of games played with service alternating between games, ending when the count of games won meets certain criteria. Typically, a player wins a set by winning at least six games and at least two games more than the opponent. If one player has won six games and the opponent five, an additional game is played. If the leading player wins that game, the player wins the set 7–5. If the trailing player wins the game, a tie-break is played. A tie-break, played under a separate set of rules, allows one player to win one more game and thus the set, to give a final set score of 7–6. Only in the final sets of matches at the Australian Open, the French Open, Wimbledon, the Olympic Games, Davis Cup, and Fed Cup are tie-breaks not played. In these cases, sets are played indefinitely until one player has a two-game lead. A "love" set means that the loser of the set won zero games. In tournament play, the chair umpire announces the winner of the set and the overall score.
In tournament play, the chair umpire announces the end of the match with the well-known phrase "Game, set, match" followed by the winning person's or team's name.
Rules variations
See also: Types of tennis match
Variations
Name
Description
No-ad
The first player or doubles team to win four points wins the game, regardless of whether the player or team is ahead by two points. When the game score reaches three points each, the receiver chooses which side of the court (advantage court or deuce court) the service is to be delivered on the seventh and game-deciding point.
Pro set
Instead of playing multiple sets, players may play one "pro set". A pro set is first to 8 (or 10) games by a margin of two games, instead of first to 6 games. A 12-point tie-break is usually played when the score is 8-8 (or 10-10). These are often played with no-ad scoring.
Match tiebreak
This is sometimes played instead of a third set. This is played like a regular tiebreak, but the winner must win ten points instead of seven. Match tiebreaks are used in the Hopman Cup for mixed doubles, on the ATP and WTA tours for doubles and as a player's choice in USTA league play.
Another, however informal, tennis format is called "Kiwi doubles", "Canadian doubles" or "cut-throat".[30] This involves three players, with one person playing a doubles team. The single player gets to utilize the alleys normally reserved only for a doubles team. Conversely, the doubles team does not use the alleys when executing a shot. The scoring is the same as a regular game. This format is not sanctioned by any official body.
"Australian doubles", another informal and unsanctioned form of tennis, is played with similar rules to the "Kiwi" style, only in this version, players rotate court position after each game. As such, each player plays doubles and singles over the course of a match, with the singles player always serving. Scoring styles vary, but one popular method is to assign a value of 2 points to each game, with the server taking both points if he or she holds serve and the doubles team each taking one if they break serve.
Wheelchair tennis can be played by able-bodied players as well as people who require a wheelchair for mobility. An extra bounce is permitted. This rule makes it possible to have mixed wheelchair and able-bodied matches. It is possible for a doubles team to consist of a wheelchair player and an able-bodied player (referred to as "one-up, one-down"), or for a wheelchair player to play against an able-bodied player. In such cases, the extra bounce is permitted for the wheelchair users only.
Officials
Main article: Official (tennis)


An umpire informing two players of the rules.
In most professional play and some amateur competition, there is an officiating head judge or chair umpire (usually referred to as the umpire), who sits in a raised chair to one side of the court. The umpire has absolute authority to make factual determinations. The umpire may be assisted by line judges, who determine whether the ball has landed within the required part of the court and who also call foot faults. There also may be a net judge who determines whether the ball has touched the net during service. In some tournaments, certain line judges, usually those who would be calling the serve, are replaced by electronic sensors that beep when an out call would have been made. In some tournaments, electric line calls aren't made, but rather are used to assist the linespeople. When a ball lands in a spot where the linesperson isn't sure if the ball was in or out, a noise is made that only linespeople can hear (because they are wearing headsets), and helps them to make the call. In some open-tournament matches, players are allowed to challenge a limited number of close calls by means of electronic review. The US Open, the NASDAQ-100 Open in Key Biscayne, Florida, the US Open Series, and World Team Tennis started using a "challenge" system in 2006 and the Australian Open and Wimbledon introduced the system in 2007. This used the Hawk-Eye system and the rules were similar to those used in the NFL, where a player gets a limited number of opportunities to challenge per match/set. More recently, a player may use unlimited challenges in a set, provided that he or she is not incorrect more than three times. In clay-court matches, such as at the French Open, a call may be questioned by reference to the mark left by the ball's impact on the court surface.
The referee, who is usually located off the court, is the final authority about tennis rules. When called to the court by a player or team captain, the referee may overrule the umpire's decision if the tennis rules were violated (question of law) but may not change the umpire's decision on a question of fact. If, however, the referee is on the court during play, the referee may overrule the umpire's decision.
Ball boys and girls may be employed to retrieve balls, pass them to the players, and hand players their towels. They have no adjudicative role. In rare events (e.g., if they are hurt or if they have caused a hindrance), the umpire may ask them for a statement of what actually happened. The umpire may consider their statements when making a decision. In some leagues, especially junior leagues, players make their own calls, trusting each other to be honest. This is the case for many school and university level matches. The referee or referee's assistant, however, can be called on court at a player's request, and the referee or assistant may change a player's call. In unofficiated matches, a ball is out only if the player entitled to make the call is sure that the ball is out.
Juniors
Main article: Junior tennis
In tennis, a junior is a player 18 and under who is still legally protected by a parent or guardian. Players on the main adult tour who are under 18 must have documents signed by a parent or guardian. These players, however, are still eligible to play in junior tournaments.
The International Tennis Federation (ITF) conducts a junior tour that allows juniors to establish a world ranking and an Association of Tennis Professionals (ATP) or Women's Tennis Association (WTA) ranking. Most juniors who enter the international circuit do so by progressing through ITF, Satellite, Future, and Challenger tournaments before entering the main circuit. The latter three circuits also have adults competing in them. Some juniors, however, such as Australian Lleyton Hewitt and Frenchman Gaël Monfils, have catapulted directly from the junior tour to the ATP tour by dominating the junior scene or by taking advantage of opportunities given to them to participate in professional tournaments.
In 2004, the ITF implemented a new rankings scheme to encourage greater participation in doubles, by combining two rankings (singles and doubles) into one combined tally. Junior tournaments do not offer prize money except for the Grand Slam tournaments, which are the most prestigious junior events. Juniors may earn income from tennis by participating in the Future, Satellite, or Challenger tours. Tournaments are broken up into different tiers offering different amounts of ranking points, culminating with Grade A.
Leading juniors are allowed to participate for their nation in the Junior Fed Cup and Davis Cup competitions as well. To succeed in tennis often means having to begin playing at a young age. To facilitate and nurture a junior's growth in tennis, almost all tennis playing nations have developed a junior development system. Juniors develop their play through a range of tournaments on all surfaces, accommodating all different standards of play. Talented juniors may also receive sponsorships from governing bodies or private institutions.
Match play


Convention dictates that two players shake hands at the end of a match.
A tennis match is intended to be continuous.[31] Because stamina is a relevant factor, arbitrary delays are not permitted. In most cases, service is required to occur no more than 20 seconds after the end of the previous point.[31] This is increased to 90 seconds when the players change ends (after every odd-numbered game), and a 120 second break is permitted between sets.[31] Other than this, breaks are permitted only when forced by events beyond the players' control, such as rain, damaged footwear, damaged racquet, or the need to retrieve an errant ball. Should a player be determined to be stalling repeatedly, the chair umpire may initially give a warning followed by subsequent penalties of "point", "game", and default of the match for the player who is consistently taking longer than the allowed time limit.[32]
In the event of a rain delay, darkness or other external conditions halting play, the match is resumed at a later time, with the same score as at the time of the delay, and the players at the same end of the court when rain halted play, or at the same position (north or south) if play is resumed on a different court.
Balls wear out quickly in serious play and, therefore, in ATP and WTA tournaments, they are changed after every nine games with the first change occurring after only seven games, because the first set of balls is also used for the pre-match warm-up.[33] As a courtesy to the receiver, the server will often signal to the receiver before the first serve of the game in which new balls are used as a reminder that they are using new balls. However, in ITF tournaments like Fed Cup, the balls are changed in a 9-11 style. Continuity of the balls' condition is considered part of the game, so if a re-warm-up is required after an extended break in play (usually due to rain), then the re-warm-up is done using a separate set of balls, and use of the match balls is resumed only when play resumes.
A recent proposed rules change is to allow coaching on court during a match on a limited basis,[34][35][36][37]. This has been instituted in womens tennis for WTA Tour events from 2009 onwards.[38]
Shots
Main article: Tennis shots
A competent tennis player has eight basic shots in his or her repertoire: the serve, forehand, backhand, volley, half-volley, overhead smash, drop shot, and lob.
Serve
Main article: Serve (tennis)


Tim Henman preparing to hit a serve. The left arm is extended, having just launched the ball into the air. The right arm will be raised up and forward at speed so that the racket connects with the ball.
A serve (or, more formally, a "service") in tennis is a shot to start a point. The serve is initiated by tossing the ball into the air and hitting it (usually near the apex of its trajectory) into the diagonally opposite service box without touching the net. The serve may be hit under- or overhand.
Experienced players strive to master the conventional overhand serve to maximize its power and placement. The server may employ different types of serve including flat serve, topspin serve, slice serve, and kick (American twist) serve. A reverse type of spin serve is hit in a manner that spins the ball opposite the natural spin of the server, the spin direction depending upon right- or left-handedness. If the ball is spinning counterclockwise, it will curve right from the hitter's point of view and curve left if spinning clockwise.
Some servers are content to use the serve simply to initiate the point; however, advanced players often try to hit a winning shot with their serve. A winning serve that is not touched by the opponent is called an "ace".
Grips
Main article: Grip (Tennis)
Players use various grips during play, including the continental (The "Handshake Grip"), eastern (Can be either semi-eastern or full eastern. Usually used for backhands.), and western (semi-western or full western, usually for forehand grips) grips. Different grips generally are used for different types of spin and shots.
Forehand
Main article: Forehand


Roger Federer preparing to hit a forehand. He is "loading" his body weight on his back (right) foot and coiling his shoulders with the help of his left hand. From this position, he will "uncoil" his body beginning with his legs, progressing to his hips and then on to his arms. This is how the "modern" forehand, utilizing the open stance, is executed.
For a right-handed player, the forehand is a stroke that begins on the right side of the body, continues across the body as contact is made with the ball, and ends on the left side of the body. There are various grips for executing the forehand, and their popularity has fluctuated over the years. The most important ones are the continental, the eastern, the semi-western, and the western. For a number of years, the small, apparently frail 1920s player Bill Johnston was considered by many to have had the best forehand of all time, a stroke that he hit shoulder-high using a western grip. Few top players used the western grip after the 1920s, but in the latter part of the 20th century, as shot-making techniques and equipment changed radically, the western forehand made a strong comeback and is now used by many modern players. No matter which grip is used, most forehands are generally executed with one hand holding the racquet, but there have been fine players with two-handed forehands. In the 1940s and 50s, the Ecuadorian/American player Pancho Segura used a two-handed forehand to achieve a devastating effect against larger, more powerful players. Currently, France's Fabrice Santoro uses a two-handed forehand. Some females such as Monica Seles and France's Marion Bartoli also use a two-handed forehand.
Backhand
Main article: Backhand


Rafael Nadal performing a backhand volley.
For right-handed players, the backhand is a stroke that begins on the left side of their body, continues across their body as contact is made with the ball, and ends on the right side of their body. It can be executed with either one hand or with both and is generally considered more difficult to master than the forehand. For most of the 20th century, the backhand was performed with one hand, using either an eastern or a continental grip. The first notable players to use two hands were the 1930s Australians Vivian McGrath and John Bromwich, but they were lonely exceptions. The two-handed grip gained popularity in the 1970s as Björn Borg, Chris Evert, Jimmy Connors, and later Mats Wilander and Andre Agassi used it to great effect, and it is now used by a large number of the world's best players, including Rafael Nadal and Serena Williams. Andy Roddick uses the extreme western grip to create massive amounts of top spin. It is difficult to do this and could possibly cause injury if done incorrectly. Two hands give the player more control, while one hand can generate a slice shot, applying backspin on the ball to produce a low trajectory bounce. Reach is also limited with the two-handed shot. The player long considered to have had the best backhand of all time, Don Budge, had a powerful one-handed stroke in the 1930s and 1940s that imparted topspin onto the ball. Ken Rosewall, another player noted for his one-handed backhand, used a very accurate slice backhand through the 1950s and 1960s. A small number of players, notably Monica Seles, use two hands on both the backhand and forehand sides.

Other shots


Justine Henin performing a backhand volley.
A volley is made in the air before the ball bounces, generally near the net, and is usually made with a stiff-wristed punching motion to hit the ball into an open area of the opponent's court. The half volley is made by hitting the ball on the rise just after it has bounced, once again generally in the vicinity of the net. The swinging volley is hit out of the air as the player approaches the net. It is an offensive shot used to take preparation time away from the opponent. From a poor defensive position on the baseline, the lob can be used as either an offensive or defensive weapon, hitting the ball high and deep into the opponent's court to either enable the lobber to get into better defensive position or to win the point outright by hitting it over the opponent's head. If the lob is not hit deeply enough into the other court, however, the opponent may then hit an overhead smash, a hard, serve-like shot, to try to end the point. Finally, if an opponent is deep in his court, a player may suddenly employ an unexpected drop shot, softly tapping the ball just over the net so that the opponent is unable to run in fast enough to retrieve it.
Tournaments
See also: List of tennis tournaments
Tournaments are often organized by gender and number of players. Common tournament configurations include men's singles, women's singles, and doubles, where two players play on each side of the net. Tournaments may be arranged for specific age groups, with upper age limits for youth and lower age limits for senior players. Example of this include the Orange Bowl and Les Petits As. There are also tournaments for players with disabilities, such as wheelchair tennis and deaf tennis.[39] In the four Grand Slam tournaments, the singles draws are limited to 128 people for each gender.
Players may also be matched by their skill level. According to how well a person does in sanctioned play, a player is given a rating that is adjusted periodically to maintain competitive matches. For example, the United States Tennis Association administers the National Tennis Rating Program, which rates players between 1.0 and 7.0 in 1/2 point increments. Average club players under this system would rate 3.0-4.5 while world class players would be 7.0 on this scale.
Challenger Tour and Futures Tournaments
The Challenger Tour for men is the lowest level of tournament administered by the ATP. It is composed of roughly 160 events and, as a result, features a more diverse range of countries hosting events.[50] The majority of players use the Challenger Series to work their way up the rankings, including World No. 1s Pete Sampras, Marcelo Ríos, Patrick Rafter, and Gustavo Kuerten. Andre Agassi, between winning Grand Slam tournaments, plummeted to World No. 141 and used Challenger Series events for match experience and to progress back up the rankings.[51] The Challenger Series offers prize funds of between US$25,000 and US$150,000.
Below the Challenger Series are the Futures Tournaments, the main events on the ITF Men's Circuit. These tournaments also contribute towards a player's ATP rankings points. Futures Tournaments offer prize funds of between US$10,000 and US$15,000; however, futures status is granted only to events offering a total of US$30,000, meaning that two or three tournaments are played.[52] Approximately 400 Futures Tournaments are played each year.
Premier events
Premier events for women form the most prestigious level of events on the Women's Tennis Association Tour after the Grand Slam tournaments. These events offer the largest rewards in terms of points and prize money. Within the Premier category are Premier Mandatory, Premier 5, and Premier tournaments. The tiering system in women's tennis was introduced in 1988. At the time of its creation, only two tournaments, the Lipton International Players Championships in Florida and the German Open in Berlin, comprised the Tier I category. In 2009, four tournaments are Premier Mandatory, five tournaments are Premier 5, and ten tournaments are Premier.
Players
Professional tennis players enjoy the same relative perks as most top sports personalities; clothing, equipment and endorsements. As an individual sport, like Golf, they are not salaried, but must play and place highly in tournaments to obtain money.
Grand Slam tournament winners
See also: Tennis statistics
Male players who have played at least part of their careers during the open era and who have won at least two singles titles at Grand Slam tournaments are as follows:
Female players who have played at least part of their careers during the open era and who have won at least two singles titles at Grand Slam tournaments are as follows:
Greatest male players
Further information: Tennis male players statistics, World number one male tennis player rankings
A frequent topic of discussion among tennis fans and commentators is who was the greatest male singles player of all time. By a large margin, an Associated Press poll in 1950 named Bill Tilden as the greatest player of the first half of the 20th century.[53] From 1920-1930, Tilden won singles titles at Wimbledon three times and the U.S. Championships seven times. In 1938, however, Donald Budge became the first person to win all four Grand Slam singles titles during the same calendar year and won six consecutive Grand Slam singles titles in 1937 and 1938. Tilden called Budge "the finest player 365 days a year that ever lived."[54] And in his 1979 autobiography, Jack Kramer said that, based on consistent play, Budge was the greatest player ever.[55] Some observers, however, also felt that Kramer deserved consideration for the title. Kramer was among the few who dominated amateur and professional tennis during the late 1940s and early 1950s. Tony Trabert has said that of the players he saw before the start of the open era, Kramer was the best male champion.[56] By the latter half of the 1950s and 1960s, Budge and others had added Pancho Gonzales and Lew Hoad to the list of contenders. Budge reportedly believed that Gonzales was the greatest player ever.[57] Gonzales said about Hoad, "When Lew's game was at its peak nobody could touch him. ... I think his game was the best game ever. Better than mine. He was capable of making more shots than anybody. His two volleys were great. His overhead was enormous. He had the most natural tennis mind with the most natural tennis physique."[58]
During the open era, first Rod Laver and then more recently Björn Borg and Pete Sampras were regarded by many of their contemporaries as among the greatest ever. Roger Federer is now considered by many observers to have the most "complete" game in modern tennis. Many experts of tennis, former tennis players and his own tennis peers believe Federer is the greatest player in the history of the game.[59][60][61][62][63][64][65]
Greatest female players
Further information: World number one women tennis players, List of WTA number 1 ranked players