NEW YORK, NY - SEPTEMBER 06: Serena Williams of the United States celebrates after defeating Madison Keys of the United States during their Women's Singles Fourth Round match on Day Seven of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 6, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)
