Tennis is a sport played between either two players ("Singles") or two teams of two players ("doubles"). Players use a stringed racquet to strike a ball, a hollow rubber ball covered in felt, over a net into the opponent's court. In some places tennis is still called lawn tennis to distinguish it from real tennis (also known as royal tennis or court tennis), an older form of the game that is played indoors on a very different court. Originating in England in the late 19th Century, the game spread first throughout the English-speaking world, particularly among the upper classes. Tennis is now an Olympic sport and is played at all levels of society, by all ages, and in many countries around the world. Except for the adoption of the tie-breaker in the 1970s, its rules have remained remarkably unchanged since the 1890s. Along with its millions of players, millions of people follow tennis as a spectator sport, especially the four Grand Slam tournaments.
Tennis is played on a rectangular, flat surface, usually grass, clay, or a hardcourt of concrete and/or asphalt. The court is 78 feet (23.77 m) long, and its width is 27 feet (8.23 m) for singles matches and 36 feet (10.97 m) for doubles matches. Additional clear space around the court is required in order for players to reach overrun balls. A net is stretched across the full width of the court, parallel with the baselines, dividing it into two equal ends. The net is 3 feet 6 inches (1.07 m) high at the posts, and 3 feet (914 mm) high in the center.

Racquet Reviews - Includes reviews on racquets, shoes and strings.
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Your Racquet - A players guide to tennis equipment including strings and rackets, and foot care.
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