Tennis can be played by people of any age or sex, either in singles matches with one player against another or doubles matches with two teams of two players each. The basic equipment needed includes a tennis ball, tennis racket, and another player or players. Points are scored by winning rallies, with games going to the first player or team to reach four points and sets going to the first to win six games and be ahead by two games. If the set is tied at six games each, a tiebreaker is played to determine the winner of the set.