GAME, SET, MATCH!: After a tournament filled with upsets and dominant performances, Sloane Stephens of the U.S. and Rafael Nadal of Spain emerged as U.S. Open champions. Check out highlights of the entire two-week tournament. Pictured: Sloane Stephens holds the trophy after defeating Madison Keys on September 9. (Robert Deutsch-USA TODAY Sports) MORE GALLERIES: U.S. Open Upsets