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Karolina Pliskova of the Czech Republic waves as she leaves Rod Laver Arena after her third round loss to to Russia's Anastasia Pavlyuchenkova at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 25, 2020. (AP Photo/Dita Alangkara)
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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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Spain's Rafael Nadal makes a backhand return to Bolivia's Hugo Dellien during their first round singles match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 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 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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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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Novak Djokovic of Serbia celebrates after defeating John Isner of the United States in their men's singles match at the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, Thursday, Oct. 10, 2019. (AP Photo/Andy Wong)
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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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Grigor Dimitrov, of Bulgaria, tapes his racket grip before facing Roger Federer, of Switzerland, in the fifth set during the quarterfinals of the U.S. Open tennis tournament Tuesday, Sept. 3, 2019, in New York. (AP Photo/Charles Krupa)
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Novak Djokovic, of Serbia, pumps his fist as he looks back toward his coach after winning a point against Denis Kudla during the third round of the U.S. Open tennis tournament Friday, Aug. 30, 2019, in New York. (AP Photo/Charles Krupa)
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Elise Mertens, of Belgium, reacts after scoring a point against Andrea Petkovic, of Germany, during round three of the US Open tennis championships Saturday, Aug. 31, 2019, in New York. (AP Photo/Michael Owens)
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Roger Federer, of Switzerland, reacts after scoring a point against Damir Dzumhur, of Bosnia, during the second round of the US Open tennis championships Wednesday, Aug. 28, 2019, in New York. (AP Photo/Eduardo Munoz Alvarez)
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Coco Gauff, of the United States, reacts after defeating Anastasia Potapova, of Russia, during the first round of the US Open tennis tournament Tuesday, Aug. 27, 2019, in New York. (AP Photo/Julie Jacobson)
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A sign for 2019 is shown on 'Murray Mound' during preparations for the Wimbledon Tennis Championships in London, Sunday, June 30, 2019. (AP Photo/Kirsty Wigglesworth)
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United States' Sloane Stephens celebrates after beating Switzerland's Timea Bacsinszky in a Women's singles match during day two of the Wimbledon Tennis Championships in London, Tuesday, July 2, 2019. (AP Photo/Kirsty Wigglesworth)
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John Isner grabs his leg during a changeover during his singles final match against Roger Federer, of Switzerland, in the Miami Open tennis tournament, Sunday, March 31, 2019, in Miami Gardens, Fla. Federer won 6-1, 6-4. (AP Photo/Lynne Sladky)
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Roger Federer, of Switzerland, kisses the trophy after defeating John Isner during the singles final of the Miami Open tennis tournament, Sunday, March 31, 2019, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)
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John Isner
