Tennis: rules and scoring

Games go 15, 30, 40, game; sets of 6 games with a tiebreak at 6-6.

Points in each game count 15, 30, 40 and game. At 40-40 (deuce), you need two points in a row: advantage and game.
A set is won by the first to 6 games with a 2-game lead. At 6-6 there is a tiebreak to 7 points, won by 2.
Matches are usually best of 3 sets; many groups play a 10-point match tiebreak instead of the third set.
The serve changes every game; players change ends after odd games (1st, 3rd, 5th…).

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