Who won U.S. Open 2014?
The winner of the U.S. Open in 2014 was Marin Cilic who defeated Kei Nishikori in a hard-fought match. Marin Cilic hails from Croatian and had an ATP ranking of 9 at the time of the tournament. On the other hand, Kei Nishikori had an ATP ranking of 5 during the tournament.