service winner

In tennis, a "service winner" is a shot that the opponent cannot return, resulting in a point for the server. To win a game, a player must win at least four points and have a two-point lead over their opponent. The scoring system, which is medieval in origin, progresses from "love" (zero) to 15, 30, and 40. If both players reach 40, the score is "deuce," and play continues until one player achieves a two-point advantage to win the game. Games constitute a set, and sets make up a match. Typically, a player needs to win six games to win a set, again with a two-game margin, though tiebreakers are often used to decide sets that reach 6-6.12