In tennis, "deuce" is a scoring term that indicates a tie score of 40-40. When the score reaches deuce, the players must win the next point to gain an "advantage" and have a chance to win the game. If the player with advantage wins the next point, they win the game. However, if the player without advantage wins the point, the score returns to deuce, and the game continues until one player wins two consecutive points to secure the game.
