Serena Williams of The United States plays a forehand during The Ladies Singles Final against Angelique Kerber of Germany on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 9, 2016 in London, England. Clive Brunskill/Getty Images hide caption

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Clive Brunskill/Getty Images

Spain's Garbine Muguruza receives the trophy after winning the final of the French Open against Serena Williams in two sets 7-5, 6-4, at the Roland Garros stadium in Paris on Saturday. Alastair Grant/AP hide caption

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Alastair Grant/AP

Serena Williams, seen here during the final of the BNP Paribas Open in Indian Wells, Calif., responded to comments by the tourney's director, saying, "Last year, the women's final at the U.S. Open sold out well before the men. I'm sorry, did Roger play in that final, or Rafa or any man play in that final that was sold out before the men's final?" Robyn Beck/AFP/Getty Images hide caption

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Robyn Beck/AFP/Getty Images

Serbia's Novak Djokovic has won the Australian Open six times — in 2008, 2011, 2012, 2013 and 2015, and then on Sunday. William West/AFP/Getty Images hide caption

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William West/AFP/Getty Images

Actually, he loves charity work: Filmmaker (and charity activist) Richard Curtis (left) poses with U.N. Secretary-General Ban Ki-moon and his special adviser Amina J. Mohammed. Kena Betancur/Getty Images for Global Goals hide caption

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Kena Betancur/Getty Images for Global Goals

Serena Williams returns a shot to Venus Williams during Tuesday's quarterfinals match of the 2015 U.S. Open in New York City. Matthew Stockman/Getty Images hide caption

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Matthew Stockman/Getty Images

Sisters Serena, left, and Venus Williams shake hands after a match in 1991 in Compton, Calif. Paul Harris/Getty Images hide caption

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Paul Harris/Getty Images

Before Superstardom, Williams Sisters Stunned On Compton's Courts

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Serena Williams en route to winning the Western & Southern Open in Cincinnati on Sunday. Tannen Maury/EPA/Landov hide caption

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Tannen Maury/EPA/Landov

What If Serena Williams Had Faced Tougher Rivals?

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Serena Williams serves the ball to Andrea Hlavackova during the first round of the French Open in Paris. Christophe Ena/AP hide caption

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Christophe Ena/AP

For Sports Immortality, The 3rd Or 4th Time's The Charm

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World No. 1 Serena Williams acknowledges the crowd after winning her match against Monica Niculescu of Romania during the BNP Paribas Open at Indian Wells Tennis Garden in Indian Wells, Calif. Charls Baus/CSM /LANDOV hide caption

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Charls Baus/CSM /LANDOV