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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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Russia's Maria Sharapova rests in her chair during her first round match against Britain's Harriet Dart at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. 14, 2019. (AP Photo/Aaron Favila)
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Australian tennis legends Evonne Goolagong Cawley and Rod Laver hold the women's and men's trophies, the Daphne Akhurst Memorial Cup and the Norman Brookes Challenge Cup at the official start of the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. 14, 2019. (AP Photo/Aaron Favila)
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FILE - In this June 24, 2010, file photo, John Isner of the United States, left, and France's Nicolas Mahut pose for a photo next to the scoreboard following their epic men's singles match at the All England Lawn Tennis Championships at Wimbledon. The Australian Open and Wimbledon are finally doing what the U.S. Open has done for decades: figuring out a way to end a fifth set before it becomes another 26-24 slog or _ perish the thought _ 70-68. While some fans and others might still like the idea that a match could go on and on and on forever, or seemingly forever, players such as John Isner are thrilled about the change. (AP Photo/Alastair Grant, Pool, File)
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FILE - In this Wednesday, Nov. 14, 2018, file photo, Novak Djokovic, of Serbia celebrates, after defeating Alexander Zverev, of Germany, in the ATP World Tour Finals men's singles tennis match at the O2 arena in London. Novak Djokovic, Rafael Nadal and Roger Federer are the top three in the year-end ATP rankings for the first time since 2014. It is the seventh time that trio of tennis greats is 1-2-3 to close a season. (AP Photo/Alastair Grant, File)
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Alexander Zverev serves against Croatia's Marin Cilic during the ATP Men's Singles Final, at The O2 Arena in London, Monday Nov. 12, 2018. Cilic made 46 unforced errors as he gave up a break advantage in both sets in losing to Alexander Zverev on Monday. (Adam Davy/PA via AP)
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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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Ernests Gulbis of Latvia returns to John Isner of US, during their semi-final of the Stockholm Open tennis tournament at the Royal Tennis Hall in Stockholm, Sweden, Saturday Oct. 20, 2018. (Erik Simander / TT via AP)
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FILE - This June 24, 2010, file photo shows John Isner of the U.S. and France's Nicolas Mahut, right, posing for a photo next to the scoreboard following their record-breaking men's singles match at the All England Lawn Tennis Championships at Wimbledon. The All England Club said Friday Oct. 19, 2018, it will introduce fifth-set tiebreakers at Wimbledon next year when a match reaches 12-12. (AP Photo/Alastair Grant, Pool, File)
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John Isner
