The word 'deuce' comes from an Old French word 'deus', meaning 'two'. The first point won after a score of deuce is called advantage, either to the server of receiver, but if that player loses the next point then the score returnes to deuce. The first player who wins six games, wins the set, provided he has won two more games than his opponent. If the score reaches five games to six, then the winning player must win the next game. If the score reaches six games all, then it becomes a tiebreak.
Men usually play the best out of five sets and women, the best out of three sets.
In most matches, when a game score of six all is reached, a tiebreak is played. Each side serves only once. This is so an not to give too great an advantage to the server. The player who wins the tiebreak game is the player who wins seven points with at least two more points than his opponent. He wins the set seven games to six.