NEW YORK, NY - AUGUST 27: Borna Coric of Croatia returns the ball during his men's singles first round match against Florian Mayer of Germany on Day One of the 2018 US Open at the USTA Billie Jean King National Tennis Center on August 27, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)
