Serve (tennis)

A serve (or, more formally, a service) in tennis is a shot to start a point. The serve is usually initiated by tossing the ball into the air and hitting it (usually near the apex of its trajectory) into the diagonally opposite service box without touching the net. It may be performed underhand or overhead. The serve is the only shot where a player can take his time to set up, instead of having to react to an opponent's shot.
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