Scoring in tennis

Game scoring.
tennis umpireThe first point won is called 15; the second point won is called 30; the third point won is called 40 and the fourth point won is called game.
If both players have won 3 points the score is called deuce and the next point won is called an advantage. If the same player wins the next point it is called game. If the other player wins the next point it is deuce again. The winner of the game must score 2 points to nil after deuce.

Set scoring.
Whoever wins the first 6 games wins the set, but it must be won by 2 games more than the opponent. The set will continue until this is the case. This is called the advantage set and usually only applies now in the last set of the match for both men and women.
Most sets are determined if the score is 6 all by a tiebreak, but this must be understood before the match commences.

The tie break
Each player has 6 games all. The player who wins the first 7 points wins the set, but this lead must be 2 more points than that of the opponent. If the score is 6 points all the game continues until one player has a 2 point advantage.
Numerical scoring is used in the tie break.
The player whose turn it is to serve, serves the first point. The opponent serves the next 2 points and thereafter the players will serve 2 points until the tie break has been decided. From the first point, each serve shall be delivered alternatively from the right and left courts, with the right court being the first serving position. If a serve is delivered form the wrong side and goes undetected the play resulting shall stand until the mistake is corrected, whereupon the correct side will be the place to serve from.

Players change ends after each 6 points and at the conclusion of the game.

The tiebreak shall count as one game for the purposes of ball changes, except that if the balls are due to be changed at the beginning of the tie break the change of balls will be delayed until the second game of the next set.
Doubles scoring in a tie break
The same procedures apply for doubles play. The player or pair who served first in the tie break shall receive serve in the first game of the next set.

In the case of undetected errors in procedure points will stand until detected at which point the play will revert to how it should have been.
The maximum number of sets will be 5 for men and 3 for women.