NEW YORK, NY - SEPTEMBER 07: Kei Nishikori of Japan shakes hands with Novak Djokovic of Serbia following following their men's singles semi-final match on Day Twelve of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 7, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)
