Does the U.S. open tennis finals match go to a tiebreaker?
Yes. The US Open is the only Grand Slam tennis tournament in which all sets are decided by a Tiebreaker when one is needed. In all of the other Grand Slam tournaments, the final set never has a Tiebreaker. Instead, the players keep playing games until one player wins the final set by 2 games. This is only for the 5th set for men and the 3rd set for women. But in the US Open, all sets in which there is a 6-6 tie enter into a Tiebreaker, which is a best of 12 points scenario in which one player must win by at least 2 points. The first player to 7, while also winning by 2 points, wins the Tiebreaker and hence the set.
Tiebreakers are thought to involve more luck than playing an infinite amount of games until someone wins by 2, but the Tiebreaker method is usually quicker. In the other Grand Slam tournaments, final sets have been known to go on for hours after the 6-6 tie, such as when a 2010 Wimbledon match featuring John Isner and Nicolas Mahut went on for over 8 hours until Isner won 70-68.
At the 2012 US Open, 3-time US Open champion and 4-time Grand Slam winner Kim Clijsters was shockingly upset by 18-year-old Laura Robson in what Clijsters has said will be her last match ever. Meanwhile, Andy Murray, Novak Djokovic, and Roger Federer have all continued to cruise toward the Semifinals, which they're all expected to reach without much trouble.