NEW YORK, NY - SEPTEMBER 04:  Gael Monfils of France falls on the court against Roger Federer of Switzerland during their men's singles quarterfinal match on Day Eleven 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.  (Photo by Alex Goodlett/Getty Images)