NEW YORK, NY – SEPTEMBER 02: Sloane Stephens of the United States celebrates after winning her women’s singles fourth round match against Elise Mertens of Belgium on Day Seven of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)