Rafael Nadal celebrates a point against Stan Wawrinka during the final of the French Open. Nadal, who has dominated on clay in his career, did not leave the outcome in doubt for long. The Spaniard claimed his record 10th French Open title on Sunday. David Vincent/AP hide caption

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David Vincent/AP

Jelena Ostapenko celebrates a point during the French Open final in Paris on Saturday. The unseeded Latvian upset Simona Halep with a ferocious performance full of both winners and unforced errors. Julian Finney/Getty Images hide caption

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Julian Finney/Getty Images

Nick Kyrgios of Australia complains to the referee during his men's singles match against Mischa Zverev of Germany at the Shanghai Masters tennis tournament on Wednesday. Johannes Eisele /AFP/Getty Images hide caption

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Johannes Eisele /AFP/Getty Images

Maria Sharapova during her quarterfinal match at the Australian Open tennis tournament in January. A drug test Sharapova took during the event later came back positive for the banned substance meldonium. Rick Rycroft/AP hide caption

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Rick Rycroft/AP

Gold medalist Andy Murray poses during the podium ceremony of the men's singles gold medal tennis event at the Olympic Tennis Center in Rio on Sunday. Luis Acosta/AFP/Getty Images hide caption

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Luis Acosta/AFP/Getty Images

Russian tennis star Maria Sharapova isn't competing at the 2016 Olympics. At a March 7 press conference in Los Angeles, she told reporters she'd tested positive for meldonium, a prescription heart drug that improves blood flow. It was banned in January by the World Anti-Doping Agency. Robyn Beck/AFP/Getty Images hide caption

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Robyn Beck/AFP/Getty Images

Olympic Athletes Still Use Some Rx Drugs As A Path To 'Legal Doping'

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Eugenie Bouchard of Canada returns to Magdalena Rybarikova of Slovakia. Bouchard says she likes the loose fit of the controversial NikeCourt Premier Slam dress. Alastair Grant/AP hide caption

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Alastair Grant/AP

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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Michel Euler/AP

The BBC and BuzzFeed published an investigative report alleging widespread match-fixing and corruption in the sport of tennis. The report was released just before the start of the Australian Open. Rafiq Maqbool/AP hide caption

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Rafiq Maqbool/AP

Serena Williams reacts after losing a point to unseeded Italian Roberta Vinci during a semifinal match at the U.S. Open tennis tournament on Friday. Williams went on to lose the match in three sets. David Goldman/AP hide caption

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David Goldman/AP