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NEW YORK, NY - SEPTEMBER 08: Runner up Serena Williams of the United States looks on after her loss to Naomi Osaka of Japan in the Women's Singles finals match on Day Thirteen of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Julian Finney/Getty Images)

NEW YORK, NY - SEPTEMBER 08:  Runner up Serena Williams of the United States looks on after her loss to Naomi Osaka of Japan in the Women's Singles finals match on Day Thirteen of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2018 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Julian Finney/Getty Images)