<|im_start|>user
Who wins the point in tennis?

Context:
Tennis is a racket sport that is played either individually against a single opponent (singles) or between two teams of two players each (doubles). Each player uses a tennis racket that is strung with cord to strike a hollow rubber ball covered with felt over or around a net and into the opponent's court. The object of the game is to manoeuvre the ball in such a way that the opponent is not able to play a valid return. The player who is unable to return the ball validly will not gain a point, while the opposite player will.<|im_end|>
<|im_start|>assistant
A player who can return the ball validly when the opposite player unable to return it.<|im_end|>
