A standard Tennis Set as we know is a race to 6 games played to a 2-game advantage or more typically a tie-break. The ITF rulebook includes no alternative set-scoring method other than the "short set" to 4 in Appendix IV. However, extended sets have been used for many tournaments, some with a race to 8 and some a race to 9. Typically any set prescribed beyond 6 games is a superset used in lieu of playing multiple sets to win matches. The 8-game pro-set is commonly used in many US amateur leagues, high school tennis and college doubles tennis tourneys.The World Team Tennis event plays a race-to-9-games.Both race-to-8 and race-to-9 are commonly used supersets.
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