The ITF's Play and Stay campaign promotes playing on smaller courts with slower red, orange, and green balls for younger children. The center service line is 2 in (5 cm), the other lines are between 1 in (2.5 cm) and 2 in (5 cm) wide, whereas the baseline may be up to 4 in (10 cm) wide. This also means that the width of the line (except for the center service line) is irrelevant to play. The ball must completely miss the line to be considered "out". The "service" lines ("T" and the "service" line) are centered. The net posts are 3 ft (0.914 m) outside the doubles court on each side or, for a singles net, 3 ft (0.914 m) outside the singles court on each side.īased on the standard rules of tennis, the size of the court is measured to the outside of the respective baselines and sidelines. The net is 3 ft 6 in (1.07 m) high at the posts, and 3 ft (0.914 m) high in the center. A net is stretched across the full width of the court, parallel with the baselines, dividing it into two equal ends. Additional clear space around the court is needed in order for players to reach overrun balls for a total of 60 ft (18 m) wide and 120 ft (37 m) long. The service line is 21 ft (6.40 m) from the net. Its width is 27 ft (8.23 m) for singles matches and 36 ft (10.97 m) for doubles matches. The dimensions of a tennis court are defined and regulated by the International Tennis Federation (ITF) governing body and are written down in the annual 'Rules of Tennis' document.
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