Tennis

Tennis is a game played between two players (singles) or between two teams of two players (doubles). Each player uses a strung racquet to strike a hollow rubber ball covered with felt (most of the time yellow, but can be any color or even two-tone) over 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" and had heavy connections to the ancient game of real tennis. After its creation, tennis spread throughout the upper-class English-speaking population before spreading around the world. 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. In the United States, there is a collegiate circuit organized by the National Collegiate Athletics Association.
Except for the adoption of the tie-breaker in the 1970s, the rules of tennis have remained remarkably unchanged since the 1890s. A recent addition to tennis has been the adoption of "instant replay" technology coupled with a point challenge system which allows a player to challenge the official call of a point.
Along with its millions of players, millions of people world-wide follow tennis as a spectator sport, especially the four Grand Slam tournaments: Australian Open, French Open, Wimbledon, and the U.S. Open. The growth of tennis in Eastern Europe and the Far East has been especially notable in recent years.

History
Tennis as the modern sport can be dated to two separate roots. Between 1859 and 1865, Major 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, England. In 1872, along with two local doctors, they founded the world's first tennis club in Leamington Spa. The Courier of 23 July 1884 recorded one of the first tennis tournaments, held in the grounds of Shrubland Hall.
In December 1873, Major Walter Clopton Wingfield designed a similar game — which he called sphairistike (Greek σφάίρίστική, 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. He based the game on the older sport of indoor tennis or real tennis. According to most 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.
The first championships at Wimbledon, in London were played in 1877. 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. The U.S. National Men's Singles Championship, now the U.S. Open, was first held in 1881 at Newport, Rhode Island. The U.S. National Women's Singles Championships were first held in 1887. Tennis was also popular in France, where the French Open dates to 1891. Thus, Wimbledon, the U.S. Open, the French Open, and the Australian Open (dating to 1905) became and have remained the most prestigious events in tennis. Together these four events are called the Grand Slam (a term borrowed from bridge). The comprehensive International Lawn 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-breaker system designed by James Van Alen. The Davis Cup, an annual competition between national teams, dates to 1900.
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. The most notable of these early professionals were the American Vinnie Richards and the Frenchwoman Suzanne Lenglen. Once a player turned pro he or she could not compete in the major (amateur) tournaments.
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. With the beginning of the open era, the establishment of an international professional tennis circuit, and revenues from the sale of television rights, tennis has spread all over the world and has lost its upper-class English-speaking image.
In 1954, Van Alen founded the International Tennis Hall of Fame, a non-profit museum in Newport, Rhode Island. 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.

Play of a single point
The players (or teams) start on opposite sides of the net. One player is designated the server, and the opposing player, or in doubles one of the opposing players, is the receiver. Service alternates between the two halves of the court. 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 over 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 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. Let services are somewhat unusual at recreational level and frequent at professional level. However, placing more than one let service in a single point takes a considerable amount of skill or luck. If the first service is otherwise faulty in any way, wide, long or not over the net, the serving player has a second attempt at service. There is also a "foot fault," which occurs when a player's foot touches the baseline or an extension of the center mark 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 over 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
A tennis match comprises a number of sets, typically three for both men's and women's matches, the exception being at the major events (Wimbledon and the Australian, French and US Opens) where the men play best of five sets. A set consists of a number of games, and games, in turn, consist of points.
A game consists of a sequence of points played with the same player serving, and is won by the first player to have won at least four points and at least two points more than his opponent. The running score of each game is described in a manner particular to tennis: scores of zero to three points are described as "love" (or zero), "fifteen," "thirty," and "forty" respectively. When at least three points have been scored by each side and the players have the same number of points, the score is "deuce." When 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. 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, he has a triple game point (triple set point, etc.). 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. It is of importance in professional tennis, since service breaks are rare enough to create a substantial advantage for the receiver in the men's game. The advantage to the server is much less in the women's game, but match analysts like to keep track of service breaks anyway. It may happen that the player who is in the lead in the game has more than one chance to score the winning point, even if his opponent should take the next point(s). For example, if the player who is serving has a score of 15-40, the receiver has a double break point. If the player in the lead wins any of the next two points, that player wins the game. Break points are not announced either.
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 when he wins at least six games and at least two games more than his opponent. When each player has won six games a tiebreaker is played. A tiebreaker, 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, Davis Cup, and Fed Cup are tie-breaks not played. A "love" set means that the loser of the set won zero games. For example if the score was 6 to 0, it would be 6 love. (See "tennis terminology" below for names given to unusual endings like the example here.) In tournament play, the chair umpire announces the winner of the set and the overall score.
Matches consist of an odd number of sets, the match winner being the player who wins more than half of the sets. The match ends as soon as this winning condition is met. Some matches may consist of five sets (the winner being the first to win three sets), while most matches are three sets (the winner being the first to win two sets). In tournament play, the chair umpire announces the end of the match with the well-known phrase "Game, set, match" followed by the winning team's name.

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