Serbia's Novak Djokovic kisses the trophy after winning the final of the French Open tennis tournament against Britain's Andy Murray in four sets 3-6, 6-1, 6-2, 6-4, at the Roland Garros stadium in Paris, Sunday. Michel Euler/AP hide caption

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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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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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Novak Djokovic of Serbia celebrates after defeating Roger Federer of Switzerland during of their 2015 US Open Men's singles final match on Sunday. Jewel Samad/AFP/Getty Images hide caption

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

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Serbia's Novak Djokovic (left) embraces Argentina's Juan Martin Del Potro after their match on day 11 of the 2013 Championships at Wimbledon. Carl Court/AFP/Getty Images hide caption

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