NEW YORK, NY - SEPTEMBER 03:  Novak Djokovic of Serbia celebrates after defeating Andy Murray of Great Britain in their men's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014 in the Flushing neighborhood of the Queens borough of New York City. Djokovic defeated Murray 7-6, 6-7, 6-2, 6-4.  (Photo by Matthew Stockman/Getty Images)