16. THE CHANGE OF SERVICE

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16.1 In singles: After five points, the receiver shall become the server and so on until the end of the game, the score 20-20, or the introduction of the expedite system.

16.2 In doubles:

16.2.1 The first five services shall be delivered by the selected
partner of the pair who has the right to serve and shall be received by the appropriate partner of the opposing pair.

16.2.2 The second five services shall be delivered by the receiver of the first five services and shall be received by the partner of the first server.

16.2.3 The third five services shall be delivered by the partner of the first server and shall be received by the partner of the first receiver.

16.2.4 The fourth five services shall be delivered by the partner of the first receiver and shall be received by the first server.

16.2.5 The fifth five services shall be delivered by the first server and the players shall thereafter serve and receive in the same sequence until the end of the game.

16.3 If both players or pairs have scored 20 points or if the expedite
system is in operation, the sequence of serving and receiving shall remain the same but each player shall serve only one point in turn until the end of the game.

16.4 The player or pair who served first in a game shall receive first in the immediately subsequent game and so on until the end of the match.

16.5 In the last possible game of a doubles match, the pair due next to receive shall change the order of receiving when first either pair scores 10 points.

16.6 In each game of a doubles match, the initial order of receiving shall be opposite to that in the immediately preceding game.