A tennis match is not defined by a single clock. Its route to a result depends on how points produce games, how games produce sets and how many sets are required. The United States Tennis Association’s scoring guide separates those layers, giving spectators a useful way to read a tournament’s published format before play begins.
Start with the match length expressed in sets. In a best-of-three match, the winner must win two sets; the match need not use all three. That phrase describes a maximum number of sets under the format, not a guarantee about duration. Competitive games and extended deciding sequences can make apparently similar matches unfold very differently.
Next, establish the set procedure. The USTA distinguishes an advantage set, which continues until a player leads by two games after reaching the required minimum, from a tiebreak set that uses a tiebreak at six games all. The word advantage here describes the set format, not just the point after deuce within an individual game.
Then check whether the deciding set has a different rule. The USTA describes a ten-point deciding tiebreak used at six games all in the Grand Slam format it outlines. Other competitions can specify their own authorized formats, so read the event’s actual regulations rather than copying assumptions from a different tournament or from a previous edition.
For planning a viewing session, these details explain possible pathways, not an exact end time. For interpreting a result, they explain why two matches can have different-looking final scorelines without any scoring error. Keep a simple note of sets required, the trigger for a tiebreak and the deciding procedure. Those are more useful than guessing duration from the names on the draw.