Tennis is a wonderful sport and is played on a rectangular, flat surface, usually grass, clay, or a hard court 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 ft (10.97 m) for doubles matches. 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 (91.4 cm) high in the center. The lines that delineate the width of the court are called the baseline (farthest back) and the service line (middle of the court). The short mark in the center of each baseline is referred to as either the hash mark or the center mark.

The outermost lines that make up the length are called the doubles sidelines. These are the boundaries used when doubles is being played. The lines to the inside of the doubles sidelines are the singles sidelines and are used as boundaries in singles play. The line that runs across the center of a player’s side of the court is called the service line because the serve must be delivered into the area between the service line and the net on the receiving side. The boxes this center line creates are called the service boxes; depending on a player’s position, he will have to hit the ball into one of these when serving. A ball is out only if none of it has hit the line upon its first bounce.

The players start 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 alternates between the two halves of the court. For each point, the server starts behind his baseline, between the center mark and the sideline. The receiver may start anywhere on their side of the net. When the receiver is ready, the server will serve, although the receiver must play to the pace of the server.

A tennis match is composed of a number of sets. Typically for both men’s and women’s matches, the first player to win two sets wins the match. At certain important tennis tournaments for men, including all four Grand Slam tournaments and the final of the Olympic Games, the first man to win three sets wins the match. A set consists of games, and games, in turn, consist of points.

A game consists of a sequence of points played with the same player serving. A game is won by the first player to have won at least four points in total and at least two points more than the opponent. If at least three points have been scored by each player, and the scores are equal, the score is “deuce”. If at least three points have been scored by each side and a player has one more point than his opponent, the score of the game is “advantage” for the player in the lead.

A game point occurs in tennis whenever the player who is in the lead in the game needs only one more point to win the game. The terminology is extended to sets (set point), matches (match point), and even championships (championship point). A break point occurs if the receiver, not the server, has a game point. Break points are of particular importance in men’s professional tennis because serving is generally advantageous.

A set consists of a sequence of games played with service alternating between games, ending when the count of games won meets certain criteria. Typically, a player wins a set by winning at least six games and at least two games more than the opponent. If the trailing player wins the game, a tiebreaker is played. A tiebreaker, played under a separate set of rules, allows one player to win one more game and thus the set, to give a final set score of 7–6. In tournament play, the chair umpire announces the winner of the set and the overall score.

Usually the best of three or best of five tournaments are being planned by the ATP, WTA and International Tennis Federation.