As a principle, when an error in respect of the Rules of Tennis is discovered, all points previously played shall stand. Errors so discovered shall be corrected as follows:
a. During a standard game or a tie-break game, if a player serves from the wrong half of the court, this should be corrected as soon as the error is discovered and the server shall serve from the correct half of the court according to the score. A fault that was served before the error was discovered shall stand.
b. During a standard game or a tie-break game, if the players are at the wrong ends of the court, the error should be corrected as soon as it is discovered and the server shall serve from the correct end of the court according to the score.
c. If a player serves out of turn during a standard game, the player who was originally due to serve shall serve as soon as the error is discovered. However, if a game is completed before the error is discovered the order of service shall remain as altered.
A fault that was served by the opponents(s) before the error was discovered shall not stand.
In doubles, if the partners of one team serve out of turn, a fault that was served before the error was discovered shall stand.d. If a player serves out of turn during a tie-break game and the error is discovered after an even number of points have been played, the error is corrected immediately. If the error is discovered after an odd number of points have been played, the order of service shall remain as altered.
A fault that was served by the opponent(s) before the error was discovered shall not stand.
In doubles, if the partners of one team serve out of turn, a fault that was
served before the error was discovered shall stand.e. During a standard game or a tie-break game in doubles, if there is an error in the order of receiving, this shall remain as altered until the end of the game in which the error is discovered. For the next game in which they are the receivers in that set, the partners shall then resume the original order of receiving.
f. If in error a tie-break game is started at 6 games all, when it was previously agreed that the set would be an “Advantage set”, the error shall be corrected immediately if only one point has been played. If the error is discovered after the second point is in play, the set will continue as a “Tie-break set”.
g. If in error a standard game is started at 6 games all, when it was previously agreed that the set would be a “Tie-break set”, the error shall be corrected immediately if only one point has been played. If the error is discovered after the second point is in play, the set will continue as an “Advantage set” until the score reaches 8 games all (or a higher even number), when a tie-break game shall be played.
h. If in error an “Advantage set” or “Tie-break set” is started, when it was previously agreed that the final set would be a match tie-break, the error shall be corrected immediately if only one point has been played. If the error is discovered after the second point is in play, the set will continue either until a player or team wins three games (and therefore the set) or until the score reaches 2 games all, when a match tie-break shall be played. However, if the error is discovered after the second point of the fifth game has started, the set will continue as a “Tie-break set”. (See Appendix IV)
i. If the balls are not changed in the correct sequence, the error shall be corrected when the player/team who should have served with new balls is next due to serve a new game. Thereafter the balls shall be changed so that the number of games between ball changes shall be that originally agreed.
Balls should not be changed during a game.