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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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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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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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

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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Before Superstardom, Williams Sisters Stunned On Compton's Courts

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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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Rafael Nadal (right) shakes hands with Tim Smyczek after winning a match at the Australian Open on Jan. 21. Rob Griffith/AP hide caption

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Rob Griffith/AP

The Tennis Court Offers A Good Lesson For The NFL

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