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Reilly Opelka returns to Yoshihito Nishioka, of Japan, during the Delray Beach Open singles final tennis match in Delray Beach, Fla., Sunday, Feb. 23, 2020. (AP Photo/Lynne Sladky)
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Sofia Kenin of the U.S. makes a forehand return to Tunisia's Ons Jabeur during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 28, 2020. (AP Photo/Andy Brownbill)
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Petra Kvitova of the Czech Republic reacts during her fourth round match against Greece's Maria Sakkari at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 26, 2020. (AP Photo/Andy Wong)
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Australia's Ashleigh Barty celebrates after defeating Kazakhstan's Elena Rybakina in their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 24, 2020. (AP Photo/Lee Jin-man)
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John Isner of the U.S. celebrates after defeating Chile's Alejandro Tabilo in their second round singles match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 23, 2020. (AP Photo/Lee Jin-man)
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Fans apply sunscreen as they wait for a match in their third round match between Argentina's Diego Schwartzman and Serbia's Dusan Lajovic at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 24, 2020. (AP Photo/Andy Wong)
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Cori "Coco" Gauff of the U.S. makes a backhand return to Romania's Sorana Cirstea during their second round singles match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2020. (AP Photo/Lee Jin-man)
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Japan's Naomi Osaka makes a forehand return to China's Zheng Saisai during their second round singles match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2020. (AP Photo/Andy Brownbill)
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Switzerland's Roger Federer celebrates after defeating United States' Steve Johnson during their first round singles match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2020. (AP Photo/Lee Jin-man)
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Russia's Maria Sharapova hits a backhand return during a practice session ahead of the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2020. (AP Photo/Andy Wong)
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Serbia's Novak Djokovic reacts after defeating France's Corentin Moutet 7-6, 6-4 during the 2nd round match of the Paris Masters tennis tournament in Paris, France, Wednesday, Oct. 30, 2019. (AP Photo/Michel Euler)
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Team Europe's Roger Federer celebrates after winning against Team World's Nick Kyrgios during their match at the Laver Cup tennis event in Geneva, Switzerland, Saturday, Sept. 21, 2019. (Salvatore Di Nolfi/Keystone via AP)
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Felix Auger-Aliassime of Canada lunges to return to compatriot Vasek Pospisil during a first round match at the Rogers Cup tennis tournament in Montreal, Tuesday, Aug. 6, 2019. (Paul Chiasson/The Canadian Press via AP)
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United States' Serena Williams returns to Germany's Julia Goerges in a Women's singles match during day six of the Wimbledon Tennis Championships in London, Saturday, July 6, 2019. (AP Photo/Ben Curtis)
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China's Shuai Zhang returns to Denmark's Caroline Wozniacki in a Women's singles match during day five of the Wimbledon Tennis Championships in London, Friday, July 5, 2019. (AP Photo/Kirsty Wigglesworth)
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Russia's Margarita Gasparyan lays injured on the court against Ukraine's Elina Svitolina in a Women's singles match during day three of the Wimbledon Tennis Championships in London, Wednesday, July 3, 2019. (AP Photo/Kirsty Wigglesworth)
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Feliciano Lopez of Spain reacts at match point after winning against Milos Raonic of Canada during their quarterfinal singles match at the Queens Club tennis tournament in London, Friday, June 21, 2019. (AP Photo/Kirsty Wigglesworth)
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Juan Martin Del Potro of Argentina plays a return to Denis Shapovalov of Canada during the Queens Club tennis tournament in London, Wednesday, June 19, 2019. (AP Photo/Kirsty Wigglesworth)
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Felix Auger-Aliassime, of Canada, reacts during the quarterfinals of the Stuttgart Open tennis tournament against Dustin Brown of Germany,, Friday, June 14, 2019, in Stuttgart, Germany. Auger-Aliassime won 7-6 (3), 6-7 (2), 7-6 (2). (Silas Stein/dpa via AP)
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Canada's Milos Raonic returns the ball to Jo-Wilfried Tsonga of France during their match at the ATP tennis event in Stuttgart, Germanany Wednesday June 12, 2019. (Silas Stein/dpa via AP)
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Milos Raonic
