In most professional tennis matches, the first player to win 2 sets wins the match

Explanation

Nearly all professional tennis matches are best of 3 sets, so the first player to win 2 sets takes the match. The best-known exception is men's singles at the four Grand Slam tournaments, which is best of 5 sets. A set itself is won by the first player to reach 6 games with a two-game margin, with a tiebreak played at 6–6.