Here is a comprehensive summary of the tennis scoring system:

Tennis matches are structured as a hierarchy of points, games, and sets, where a set is won by the first player to win six games with a two-game margin, and a match is won by taking the majority of sets (either best-of-three or best-of-five). The game's point scoring is famously unconventional, using calls of "15," "30," and "40" instead of 1, 2, and 3, and requiring a two-point lead to win the game. When both players reach three points (40-40), the score is called "deuce", and the next point gives the winner an "advantage", with the game continuing until one player wins two consecutive points. If a set becomes tied at 6-6, a tiebreak is typically played to decide the set, preventing an endless marathon. The best-of-five format is primarily reserved for men's singles at Grand Slam tournaments, while most other professional matches use best-of-three. Tournaments are usually single-elimination, with brackets often seeded according to rankings to keep top players apart until later rounds, and byes given to the highest-seeded competitors when the field isn't a perfect power of two.