Serena Williams and Sloane Stephens chat after Williams beat Stehpens at the U.S. Open tennis tournament 6-4, 6-1 on Sept. 1.
Sloane Stephens of the U.S. serves to compatriot Serena Williams during their women's singles quarter-final match at the Australian Open tennis tournament in Melbourne, January 23, 2013. REUTERS/Tim Wimborne (AUSTRALIA - Tags: SPORT TENNIS TPX IMAGES OF THE DAY)
Stefan 'Redfoo' Gordy of the American electro duo LMFAO takes his seat for the start of the women's singles final match between Serena Williams of the United States and Victoria Azarenka of Belarus at the 2012 US Open, Sep. 9, 2012, New York City.
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Serena Williams in a match during the 2015 Hopman Cup in Perth, Australia on Jan. 10, 2015
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Serena Williams holds the Daphne Akhurst Memorial Cup after winning the women's final match against Maria Sharapova at the Australian Open on Jan. 31, 2015 in Melbourne, Australia.
Serena Williams of the U.S., celebrates after defeating Alison Van Uytvanck of Belgium during their first-round match at the Australian Open tennis championship in Melbourne on Jan. 20, 2015
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Serena Williams of the US celebrates the first set point against Flavia Pennetta of Italy during their US Open 2014 women's quarterfinals match at the USTA Billie Jean King National Center September 3, 2014 in New York.
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Serena Williams of the U.S. serves to Ana Ivanovic of Serbia during their women's singles match at the Australian Open 2014 tennis tournament in Melbourne January 19, 2014.
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Serena Williams of the U.S. celebrates her victory against Li Na of China after their WTA tennis championships final match in Istanbul, October 27, 2013.
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Serena Williams of the U.S. celebrates her win over Victoria Azarenka of Belarus during their 2013 U.S. Open women's singles final match at the USTA Billie Jean King National Tennis Center, Sept. 8, 2013 in New York.
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Serena Williams of the U.S. holds the trophy as she celebrates her win over Victoria Azarenka of Belarus during their 2013 U.S. Open women's singles final match at the USTA Billie Jean King National Tennis Center Sept. 8, 2013 in New York
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Serena Williams of the United States returns a shot during her victory in the Rogers Cup women's final against Sorana Cirstea of Romania at Rexall Centre at York University in Toronto, Ontario, August 11, 2013.
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Serena Williams of the United States returns to Sabine Lisicki of Germany during a Women's singles match at Wimbledon
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Serena Williams talks to the media during previews for Wimbledon Championships at Wimbledon on June 23, 2013 in London.
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Serena Williams of the United States returns a shot against Andrea Hlavackova of Czech Republic during their women's singles fourth round match on Day Eight of the 2012 US Open at USTA Billie Jean King National Tennis Center on Sept. 3, 2012, in New York City.
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Serena Williams photographed at her home court at BallenIsles in Palm Beach Gardens, Florida.
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United States' Serena Williams celebrates after defeating Maria Sharapova of Russia to win the women's singles gold medal match at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, on Aug. 4, 2012.
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Maria Sharapova of Russia looks on against Serena Williams of the United States during the gold medal match of the Women's Singles Tennis on Day 8 of the London 2012 Olympic Games at the All England Lawn Tennis and Croquet Club on August 4, 2012 in London, England.