NEW YORK, NY - SEPTEMBER 03: Novak Djokovic of Serbia celebrates match point during the men's singles fourth round match against Jaoa Sousa of Portugal on Day Eight of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)
NEW YORK, NY - SEPTEMBER 03: Novak Djokovic of Serbia celebrates after match point during the men's singles fourth round match against Jaoa Sousa of Portugal on Day Eight of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)
