NEW YORK, NY - SEPTEMBER 05: Marin Cilic of Croatia reacts during the men's singles quarter-final match against Kei Nishikori of Japan on Day Ten of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 5, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)
