The Rules Of Tennis

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The Singles Game

22. Tennis Ball Falls on Line
A tennis ball falling on a line is regarded as falling in the Tennis Court bounded by that line.

USTA Comment: In a non-officiated match, each tennis player makes the call on any tennis ball hit toward his side of the net. If a tennis player cannot call a ball out with certainty he should regard it as good. In doubles, normally the Receiver's partner makes the calls with respect to the service line, with the Receiver calling the side and center lines, but either partner may make the call on any tennis ball he clearly sees out.