<P> The set is won by the first player (or team) to have won at least six games and at least two games more than his or her opponent . Traditionally, sets would be played until both these criteria had been met, with no maximum number of games . To shorten matches, James Van Alen created a tie - breaker system, which was widely introduced in the early 1970s . If the score reaches 6--5 (or 5 - 6), one further game is played . If the leading player wins this game, the set is won 7--5 (or 5 - 7). If the trailing player wins the game, the score is tied at 6--6 and a special tiebreaker game is played . The winner of the tiebreak wins the set by a score of 7--6 (or 6 - 7). </P> <P> The tiebreak is sometimes not employed for the final set of a match and an advantage set is used instead . Therefore, the deciding set must be played until one player or team has won two more games than the opponent . This is true in three of the four major tennis championships, all except the US Open where a tiebreak is played even in the deciding set (fifth set for the men, third set for the women) at 6--6 . A tiebreak is not played in the deciding set in the other three majors--the Australian Open, the French Open, and Wimbledon . (When the tiebreak was first introduced at Wimbledon in 1971, it was invoked at 8--8 rather than 6--6 .) The US Open holds "Super Saturday" where the two men's semi-finals are played along with the women's final on the second Saturday of the event; therefore a tie - break is more prudent where player rest and scheduling is more important . </P> <P> At a score of 6--6, a set is often determined by one more game called a "twelve point tiebreaker". Only one more game is played to determine the winner of the set; the score of the set is always 7--6 (or 6--7). Points are counted using ordinary numbering . The set is decided by the player who wins at least seven points in the tiebreak but also has two points more than his or her opponent . For example, if the score is 6 points to 5 points and the player with 6 points wins the next point, he or she wins the tiebreak and the set . If the player with 5 points wins the point, the tiebreak continues and cannot be won on the next point, since no player will be two points better . In the scoring of the set, sometimes the tiebreak points are included as well as the game count, for example 7--6 . Another way of listing the score of the tiebreak is to list only the loser's points . For example, if the set score is listed as 7--6, the tiebreak score was 10--8 (since 8 is the loser's points, and the winner must win by two points). Similarly, 7--6 means the tiebreak score was 7--3 . </P> <P> The player who would normally be serving after 6--6 is the one to serve first in the tiebreak, and the tiebreak is considered a service game for this player . The server begins his or her service from the deuce court and serves one point . After the first point, the serve changes to the first server's opponent . Each player then serves two consecutive points for the remainder of the tiebreak . The first of each two - point sequence starts from the server's advantage court and the second starts from the deuce court . In this way, the sum of the scores is even when the server serves from the deuce court . After every six points, the players switch ends of the court; note that the side - changes during the tiebreak will occur in the middle of a server's two - point sequence . At the end of the tiebreak, the players switch ends of the court again, since the set score is always odd (13 games). </P>

When do you get a tiebreaker in tennis
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