NEW YORK, NY - SEPTEMBER 09: Novak Djokovic of Serbia poses with Juan Martin del Potro of Argentina after winning his men's Singles finals match on Day Fourteen of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 9, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)
