NEW YORK, NY - SEPTEMBER 06:  Marin Cilic of Croatia celebrates after defeating Roger Federer of Switzerland during their men's singles semifinal match on Day Thirteen of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 6, 2014 in the Flushing neighborhood of the Queens borough of New York City.  Cilic defeated Federer in three sets 6-3, 6-4, 6-4.  (Photo by Streeter Lecka/Getty Images)