How to keep score in Tennis

Points within a game

Points count 0 (love), 15, 30, 40, then game. You must win by two points. At 40-40 it is deuce: the next point is advantage, and you must win two points in a row from deuce to take the game.

Games and sets

Win 6 games (by 2) to win a set. At 6-6 a tiebreak is played — first to 7 points, win by 2 — and the set is recorded 7-6. A match is best of 3 or best of 5 sets.

Serving

One player serves an entire game; serve alternates each game. In a tiebreak, serve rotates every two points after the first point. Players change ends every odd game.