John Isner

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Top seed John Isner makes his way off the court after defeating Dennis Novikov, 6-4, 6-4, in their quarterfinal match at the Hall of Fame Tennis Championships, Friday, July 21, 2017, in Newport, R.I. (AP Photo/Elise Amendola)

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Top seed John Isner reacts after defeating Dennis Novikov, 6-4, 6-4, in their quarterfinal match at the Hall of Fame Tennis Championships, Friday, July 21, 2017, in Newport, R.I. (AP Photo/Elise Amendola)

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Donald Young, of the United States, returns a shot to John Isner, of the United States, in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)

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Donald Young, of the United States, returns a shot to John Isner, of the United States, in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)

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John Isner, of the United States, watches the flight of a shot to Donald Young, of the United States, in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)

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John Isner, of the United States, reacts to a call that went against him in a quarterfinal against Donald Young, of the United States, at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)

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Donald Young, of the United States, celebrates after defeating John Isner, of the United States, in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)

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Donald Young, of the United States, celebrates after defeating countryman John Isner in a quarterfinal at the Memphis Open tennis tournament Friday, Feb. 17, 2017, in Memphis, Tenn. (AP Photo/Mark Humphrey)

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United States' John Isner returns the ball to Switzerland's Henri Laaksonen during a Davis Cup tennis match, Friday, Feb. 3, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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Switzerland's Henri Laaksonen returns the ball to United States' John Isner during a Davis Cup tennis match, Friday, Feb. 3, 2017, in Birmingham, Ala. (AP Photo/Butch Dill)

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Kei Nishikori celebrates after he beat John Isner 4-6, 6-4, 6-4, in a men's singles final match at the Citi Open on Sunday at the Rock Creek Park Tennis Center. (Associated Press)

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John Isner, of the United States, reacts after a shot Philipp Kohlschreiber, of Germany, during the third round of the 2014 U.S. Open tennis tournament, Saturday, Aug. 30, 2014, in New York. (AP Photo/Darron Cummings)

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John Isner of U.S. plays a return to Feliciano Lopez of Spain during their men's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 30, 2014. (AP Photo/Pavel Golovkin)

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John Isner of the U.S. serves the ball during the fourth round match of the French Open tennis tournament against Tomas Berdych of the Czech Republic at the Roland Garros stadium, in Paris, France, Sunday, June 1, 2014. (AP Photo/Michel Spingler)

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Tomas Berdych of the Czech Republic returns the ball during the fourth round match of the French Open tennis tournament against John Isner of the U.S. at the Roland Garros stadium, in Paris, France, Sunday, June 1, 2014. (AP Photo/Michel Spingler)

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John Isner of the U.S, sticks his tongue out as he plays Tomas Berdych of the Czech Republic during their fourth round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Sunday, June 1, 2014. (AP Photo/Darko Vojinovic)

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