Best of three (or five) (tennis), Glossary and Terms, Amusement, Recreation & Ticket Services
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"Best of three (or five) (tennis)" - Amusement Glossary Terms and Abbreviations
Refers to the maximum number of sets in any match. In "best of three" matches, players need to win two of the three sets. In men's tennis, matches can be "best of five," i.e. a match finishes when a player has won three sets.