Terminology
Underspin
A serve where the receiver fails to return or touch the tennis ball
Umpire
An independent person who enforces the rules of the game during a match. He decides who wins the points and keeps score
Underarm Service
Where the server delivers the ball with his or her racket below shoulder level. In professional tennis this is considered insulting
Unforced error
An error made by a player who is under no pressure from the opponent, either by poor judgement or execution of shot
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