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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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Germany's Angelique Kerber makes a backhand return to Italy's Camila Giorgi during their third round singles match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 25, 2020. (AP Photo/Andy Brownbill)
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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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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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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 Karen Khachanov, left, shakes hands over the net with Norway's Viktor Durasovic after their ATP Cup tennis match in Perth, Australia, Tuesday, Jan. 7, 2020. (AP Photo/Trevor Collens)
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Nick Kyrgios of Australia reacts after winning his match against Jan-Lennard Struff of Germany at the ATP Cup tennis tournament in Brisbane, Australia, Friday, Jan. 3, 2020. (AP Photo/Tertius Pickard)
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Canada's Denis Shapovalov, left, and his partner Vasek Pospisil celebrate after winning their Davis Cup semifinal doubles match against Russia's Karen Khachanov and Andrey Rublev, in Madrid, Spain, Saturday, Nov. 23, 2019. (AP Photo/Bernat Armangue)
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Ashleigh Barty of Australia hits a return shot while competing against Kiki Bertens of the Netherlands in their semifinal match in the China Open tennis tournament in Beijing, Saturday, Oct. 5, 2019. (AP Photo/Mark Schiefelbein)
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Daniil Medvedev, of Russia, reaches out for the ball in his match against Dominic Thiem, of Austria, during quarterfinal play at the Rogers Cup tennis tournament in Montreal, Friday, Aug. 9, 2019. (Paul Chiasson/The Canadian Press via AP)
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Dominic Thiem of Austria serves to Marin Cilic of Croatia during the Rogers Cup men’s tennis tournament Thursday, Aug. 8, 2019, in Montreal. (Paul Chiasson/The Canadian Press via AP)
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Steve Johnson from United States returns the ball to Germany's Philipp Kohlschreiber during their first round mat at the ATP tennis tournament in Halle Westphalia, Germany, Monday, June 17, 2019. (Friso Gentsch/dpa via AP)
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Amanda Anisimova of the U.S. plays a shot against Spain's Aliona Bolsova during their fourth round match of the French Open tennis tournament at the Roland Garros stadium in Paris, Monday, June 3, 2019. (AP Photo/Christophe Ena)
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Madison Keys of the U.S. celebrates winning her fourth round match of the French Open tennis tournament against Katerina Siniakova of the Czech Republic in two sets, 6-2, 6-4, at the Roland Garros stadium in Paris, Monday, June 3, 2019. (AP Photo/Pavel Golovkin)
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Switzerland's Roger Federer plays a shot against Argentina's Leonardo Mayer during their fourth round match of the French Open tennis tournament at the Roland Garros stadium in Paris, Sunday, June 2, 2019. (AP Photo/Pavel Golovkin)
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Two spectators watch a match from an adjacent court at the French Open tennis tournament at the Roland Garros stadium in Paris, Saturday, June 1, 2019. (AP Photo/Michel Euler)
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Romania's Simona Halep serves against Ukraine's Lesia Tsurenko during their third round match of the French Open tennis tournament at the Roland Garros stadium in Paris, Saturday, June 1, 2019. (AP Photo/Christophe Ena )
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Karen Khachanov of Russia returns the ball to Philipp Kohlschreiber of Germany during his round of sixteen match at the ATP tennis tournament in Munich, Germany, Thursday, May 2, 2019. (AP Photo/Matthias Schrader)
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Karen Khachanov of Russia raises the trophy after defeating Novak Djokovic of Serbia in their final match of the Paris Masters tennis tournament at the Bercy Arena in Paris, France, Sunday, Nov. 4, 2018. (AP Photo/Michel Euler)
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Karen Khachanov of Russia celebrates after defeating Dominic Thiem of Austria during their semifinal match of the Paris Masters tennis tournament at the Bercy Arena in Paris, France, Saturday, Nov. 3, 2018. (AP Photo/Thibault Camus)
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Austria's Dominic Thiem celebrates after defeating Jack Sock of the U.S. during their quarter-final match of the Paris Masters tennis tournament at the Bercy Arena in Paris, France, Friday, Nov. 2, 2018. (AP Photo/Christophe Ena)
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Karen Khachanov of Russia, right, holds the trophy after winning the final match of the Kremlin Cup tennis tournament against Adrian Mannarino of France in Moscow, Russia, Sunday, Oct. 21, 2018. (AP Photo/Pavel Golovkin)
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Karen Khachanov
