Best of five for mens and three sets for women. In the third and fifth sets a player has to win by two games to win the match that's why a match at Wimbledon went to 64-62.
2009 US Open Men's Final, Juan Martin Del Potro won against Federer in 5 sets, after 4 hours - YouTube.
In 2010 the mens, ladies, mens doubles, ladies doubles and mixed doubles were all won in straight sets!
Profession men's doubles tennis tournaments usually play best 2 out of 3 sets. However, the four grand slam tournaments still play best 3 out of 5 sets.
Leander Paes and Radek Stepanek won the 2012 Australian Open in Men's Doubles. They beat Americans Mike and Bob Bryan in straight sets, 7-6 (7-1) and 6-2. Leander Paes is from India and Radek Stepanek is from the Czech Republic. They also won the US Open Mens' Doubles in 2013.
Closed sets and open sets, or finite and infinite sets.
Closed sets and open sets, or finite and infinite sets.
Closed sets and open sets, or finite and infinite sets.
Andre Agassi defeated Goran Ivanisevic in 5 sets
Closed sets and open sets, or finite and infinite sets.
For womens it can last up to 3 hours (playing 3 sets) - however the average is about 2 - and for mens it can go up to 5 hours (playing 5 sets) but the average is about 3 and 1/2 Hope this is what you were looking for!
Matches in the US Open are typically played in a best-of-five sets format.
Men - best 3 of 5 Women - best 2 of 3