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 strung with a cord to strike
a hollow rubber ball covered with felt over or around a net and into the
opponent's court. The object is to manoeuvre the ball in such a way that
the opponent is not able to play a valid return. If a player is unable
to return the ball successfully, the opponent scores a point.
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