NEW YORK, NY - SEPTEMBER 03: Kei Nishikori of Japan celebrates after winning his men's singles fourth round match against Philipp Kohlschreiber of Germany 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 Al Bello/Getty Images)
