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Tennis is played on a rectangular flat surface, usually of grass, clay, concrete or a synthetic such as "Rebound Ace". Concrete courts usually are coated with a synthetic surface to provide color to the surface and a particular bounce characteristic for the tennis ball. Coated concrete courts are generally referred to as "hard courts". White lines are drawn on the ground to delimit the tennis court. 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. The lines at the ends of the court are called baselines, and the lines at the sides are called sidelines. There is additional clear space around the court.
A net is stretched across the full width of the court, parallel with the baselines, in the middle, dividing it into two ends, each of which is 39 feet (11.89 m) long. The net posts are centred 3 feet (914 mm) outside the court. The net is 3 feet 6 inches (1.07 m) high at the posts, and 3 feet (914 mm) high in the centre, where it is strapped to the ground. A white band marks the top of the net.
There are two more types of line used to delimit the service courts. Servicelines are parallel with the baselines and the net, 21 feet (6.40 m) from the net on each side, drawn only between the singles sidelines. The centre serviceline is parallel with the sidelines, in the centre of the court, drawn between the servicelines only. The centre serviceline is echoed in a white strap in a vertical orientation in the centre of the net. The four service courts are the rectangular areas each delimited by the net, a singles sideline, a serviceline, and the centre serviceline.
The service court on the player's right is known as the deuce court, while the service court on the left is known as the advantage court, or ad court for short.
The centre of each baseline is marked by a short centre mark.
All the lines, except those marking the centre, are drawn just within the court that they delimit. Thus it is the outer edge of each line that is significant.
The players (or teams) stand on opposite sides of the net. One player is designated the server, and the opposing player, or in doubles one of the opposing players, is the receiver. Service takes place in either the left or right half of the court. All of these designations are discussed in later sections.
The server stands strictly behind his baseline, between the centre mark and the sideline at the appropriate side of the court. The receiver may stand anywhere on his side of the net, in practice usually around the diagonally opposite section of baseline. When the receiver is ready, the server serves by releasing the ball from his hand in any manner (usually tossing it up in the air) and hitting it with his racquet before it hits the ground (usually near the apex of its trajectory). A player may bounce or toss the ball as often as desired before serving, and does not have to declare when he is about to serve; thus a player unsatisfied with his toss can let the ball fall to the ground and try again. However, if he swings the racquet and misses the ball this is a faulty service.
The server is required to keep his feet in nearly the same position during the service motion. Slight movements are permitted, and the feet may be raised off the ground, but walking or running are not permitted. This is to prevent the opponent being misled as to where the serve will originate. Breaching this rule or exceeding the permitted part of the court constitutes a foot fault.
In a legal service, the ball, after being hit by the server, travels over the net without touching it and then bounces in the diagonally opposite service court. If the ball hits the net but the service is otherwise legal (the ball goes over the net and lands in the service court), this is a let service, which is void, and the service is attempted again as if the let service had never occurred. If the first service (excluding let services) is faulty in any way, then the serving player has a second attempt at service. If the second service (excluding let services) is also faulty, this is a double fault and the receiver wins the point.
A legal service starts a rally, in which the players alternately hit the ball across the net. A legal return consists of the player/team hitting the ball exactly once, before it has bounced twice or hit any fixtures, such that it then travels back over the net and bounces in the court on the opposite side. The first player/team to fail to make a legal return loses the point.
If a player hits the ball before it has bounced at all on his side of the net, then the preceding return from his opponent is legal despite the ball not having bounced. Touching the net, hitting the ball before it has passed the net, touching the ball with anything other than the racquet, deliberately hitting the ball twice, and various other transgressions result in losing the point. In wheelchair tennis, in which the players move in wheelchairs instead of using legs, an extra bounce is permitted: the player must hit the ball before it has bounced three times. In doubles, after the service and initial return either player may make any return; it is not permitted for both players on a team to hit the ball in the same return.
The ball is deemed to have bounced inside a court if any part of the ball has touched the ground inside the court. Because the lines are drawn just inside the courts, this means that the ball is in if any part of it touches any part of the relevant line. Judgement of this is made more difficult because the ball deforms greatly when it bounces, so it covers a much greater area on the ground than is intuitively apparent. On clay courts the ball leaves an impression in the ground that can be checked, and on grass courts a puff of chalk from the line indicates contact from the ball.
In an unumpired game, the players are to give each other the benefit of the doubt in all line calls. In an umpired game it is for the umpire or line umpire to call "out". The umpire may overrule an "out" call from a line umpire by immediately calling "play on". In high-level tournaments, automatic equipment is increasingly used for line calls, especially for the serviceline.