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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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Japan's Naomi Osaka reacts after winning the first set against Ukraine's Elina Svitolina during their quarterfinal match at the Australian Open tennis championships in Melbourne, Australia, Wednesday, Jan. 23, 2019. (AP Photo/Kin Cheung)
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Greece's Stefanos Tsitsipas celebrates after defeating Switzerland's Roger Federer in their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Sunday, Jan. 20, 2019. (AP Photo/Mark Schiefelbein)
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Ukraine's Elina Svitolina makes a forehand return to United States' Madison Keys during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. 21, 2019. (AP Photo/Aaron Favila)
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Ukraine's Elina Svitolina reacts after winning a point against United States' Madison Keys during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. 21, 2019. (AP Photo/Aaron Favila)
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Japan's Naomi Osaka throws her racket in frustration during her third round match against Taiwan's Hsieh Su-Wei at the Australian Open tennis championships in Melbourne, Australia, Saturday, Jan. 19, 2019. (AP Photo/Kin Cheung)
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Italy's Camila Giorgi makes a forehand return to Poland's Iga Swiatek during their second round match at the Australian Open tennis championships in Melbourne, Australia, Thursday, Jan. 17, 2019. (AP Photo/Andy Brownbill)
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Poland's Kamil Majchrzak, left, congratulates Japan's Kei Nishikori after retiring injured in their first round match at the Australian Open tennis championships in Melbourne, Australia, Tuesday, Jan. 15, 2019. (AP Photo/Mark Schiefelbein)
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Spain's Rafael Nadal serves to Australia's James Duckworth in their first round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. 14, 2019. (AP Photo/Aaron Favila)
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United States' Madison Keys hits a forehand return to Australia's Destanee Aiava during their first round match at the Australian Open tennis championships in Melbourne, Australia, Tuesday, Jan. 15, 2019. (AP Photo/Kin Cheung)
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Daniil Medvedev of Russia plays a shot during his quarter final match against Milos Raonic of Canada at the Brisbane International tennis tournament in Brisbane, Australia, Friday, Jan. 4, 2019. (AP Photo/Tertius Pickard)
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Rafael Nadal of Spain talks to media as he announces his withdraw from the Paris Masters tennis tournament at the Bercy Arena in Paris, France, Wednesday, Oct. 31, 2018. (AP Photo/Christophe Ena)
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Milos Raonic
