NEW YORK, NEW YORK - AUGUST 27: Rafael Nadal of Spain serves a shot from John Millman of Australiaduring their Men's Singles first round match on day two of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 27, 2019 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Chaz Niell/Getty Images)
