Tennis is a racket sport that can be played 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 maneuver 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 will not gain a point, while the opposite player will.


Any court surface may be used indoors. Hard courts[8] are most common indoors, as they are made with the most versatile materials and surface finishes. Clay courts are installed indoors with underground watering systems, and used mostly for Davis Cup matches. The conclusion of the Wimbledon Championships, in 2012, was played on the lawn of Centre Court under the closed roof and artificial lights. The Halle Open has also seen a number of matches played on its grass court in the Gerry Weber Stadion with the roof closed. Carpet surfaces have been used both on the ATP World Tour and World Championship Tennis circuit, though no events currently use them. Historically, other surfaces have been used indoors such as hardwood at the defunct World Covered Court Championships and London Indoor Professional Championships. Currently, the ATP World Tour Finals event is the most important indoor tennis tournament.
Tennis is a racket sport that can be played 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 maneuver 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 will not gain a point, while the opposite player will.
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