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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 celebrates after defeating Felix Auger-Aliassime, of Canada, during their semifinal match at the Miami Open tennis tournament, Friday, March 29, 2019, in Miami Gardens, Fla. Isner won 7-6 (3), 7-6 (4). (AP Photo/Lynne Sladky)
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Felix Auger-Aliassime, of Canada, serves to Borna Coric, of Croatia, during the quarterfinals of the Miami Open tennis tournament Wednesday, March 27, 2019, in Miami Gardens, Fla. (AP Photo/Jim Rassol)
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John Isner, returns a volley to Kyle Edmund, of the United Kingdom, during the Miami Open tennis tournament, Tuesday, March 26, 2019, in Miami Gardens, Fla. (AP Photo/Joel Auerbach)
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John Isner returns a volley to Albert Ramos-Vinglas, of Spain, during the Miami Open tennis tournament, Sunday, March 24, 2019, in Miami Gardens, Fla. (AP Photo/Joel Auerbach)
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United States' John Isner reacts during his first round match against compatriot Reilly Opelka at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. 14, 2019. (AP Photo/Mark Schiefelbein)
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Serbia's Novak Djokovic smiles during a press conference at the Australian Open tennis championships in Melbourne, Australia, Sunday, Jan. 13, 2019. (AP Photo/Aaron Favila)
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John Isner
