NEW YORK, NY - SEPTEMBER 09: Gael Monfils of France returns a shot against Novak Djokovic of Serbia during their Men's Singles Semifinal Match on Day Twelve of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 9, 2016 in the Queens borough of New York City. (Photo by Chris Trotman/Getty Images for USTA)
