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It is your obligation to call all balls on your side, to help your opponent make calls when the opponent requests it, and to call against yourself (with the exception of a first service) any ball that you clearly see out on your opponent’s side of the net.
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If you have any doubt as to whether a ball is out or good, you must give your opponent the benefit of the doubt and play the ball as good. You should not play a let.
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In doubles, when returning service, the partner of the receiver should call the service line for him/her, with the receiver calling the centre and side service lines.
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Any “out”, “let” or “fault” call must be made instantaneously (i.e. made before either an opponent has hit the return or the return has gone out of play); otherwise, the ball continues in play.
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If you call a ball “out”, and then realise it was good, you should correct your call.
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Do not enlist the aid of spectators in making line calls.
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If players cannot agree on the score, they may go back to the last score on which there was agreement and resume play from that point.
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Players are prohibited from checking the mark of the ball on their opponent’s side of the court.
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Wait until a point is over before walking behind a court where a match is in progress.
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To retrieve a ball from another court or to return a ball to another court, wait until the players have completed a point.