If announced in advance of the match, a tie-break game operates when the score reaches six games all in any set.

In singles, the player who first wins seven points wins the game and the set provided he or she leads by a margin of two points.
If the score reaches six points all the game is extended until this margin has been achieved.
Numerical scoring is used throughout the tie-break.
The player whose turn it is to serve is the Server for the first point; his or her opponent is the Server for the second and third points; and, thereafter, each player serves alternately for two consecutive points until the winner of the game and set has been decided.
In doubles, the player whose turn it is to serve is the Server for the first point. Thereafter, each player serves in rotation for two points, in the same order as determined previously in that set, until the winners of the game and set have been decided.
Starting with the first point, each service is delivered alternately from the right and left courts, beginning from the right court.
The first Server serves the first point from the right court; the second Server serves the second and third points from the left and right courts respectively; the next Server serves the fourth and fifth points from the left and right courts, respectively; and so on.
Players change ends after every six points and at the conclusion of the tie-break game. The player (or doubles pair) who served first in the tie-break shall receive service in the first game of the following set. (In other words, the tie-break counts as a service game for the player who serves the first ball.)