serve until the other side is ready; ordinarily, the players of the receiving side are expected to be ready. During the game the player must not leave the court except in the act of playing, if he has an accident, or with the referee's permission for activities such as changing a racket, tying a shoelace, or tightening a belt. The referee normally grants a player's request for such activities, unless the ball is in play; however, he has the final right to refuse if he deems such activities delaying tactics. In "fives" tournaments, a team consists of ten formally designated players, any five of whom play while the other five remain on the sidelines with the team manager, ready to play. Doubles tournaments use teams of three players. During a match of two or three games, three player substitutions are allowed. Substitutions may be made at any time during the game. The ball may not be changed during a three-game match set, unless it is damaged. Faults If a fault is made by the serving team, the serving player shall be replaced by a teammate. If all five players on a team commit a serving fault, the serve goes to the receiving team. If a fault is made by the receiving team, the serving team is awarded a point and continues to serve. It is a fault if: The server is not stationary (both feet on the ground) while serving The server misses his stroke The ball is served overhand (hits the racket above the server's waist) Service is delivered from the wrong court (right instead of left, or vice versa) The ball touches the ground before it is returned The ball served drops into the wrong court or on a line (center, serving crease, side or boundary) A player serves out of turn (before the previous server is out) Any part of the server's body or racket crosses any of the lines when serving (even a foot on line is out of court) A "double touch" is made (a player, while making a stroke, hits the ball more than once) A "tip" is made (the ball is touched by two rackets of the same team in succession) A "clash" is made (the rackets of two or more players clash in playing the ball before, during, or after striking the ball) A player—or his racket—crosses the net line during the