Stan Wawrinka

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FILE - In this July 3, 2017, file photo, Switzerland's Stan Wawrinka reacts during his men's singles match against Russia's Daniil Medvedev on the opening day at the Wimbledon Tennis Championships, in London. Defending champion Stan Wawrinka has pulled out of the U.S. Open with an injured knee. Wawrinka announced Friday, Aug. 4, 2017, he would sit out the rest of 2017 because of the knee. (AP Photo/Kirsty Wigglesworth, File)

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FILE - In this Sept. 11, 2016, file photo, Stan Wawrinka, of Switzerland, returns a shot to Novak Djokovic, of Serbia, during the men's singles final at the U.S. Open tennis tournament, in New York. Defending champion Stan Wawrinka has pulled out of the U.S. Open with an injured knee. Wawrinka announced Friday, Aug. 4, 2017, he would sit out the rest of 2017 because of the knee. (AP Photo/Charles Krupa, File)

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FILE - In this July 3, 2017, file photo, Switzerland's Stan Wawrinka ices his knee during a break in his men's singles match against Russia's Daniil Medvedev, on the opening day at the Wimbledon Tennis Championships, in London. Defending champion Stan Wawrinka has pulled out of the U.S. Open with an injured knee. Wawrinka announced Friday, Aug. 4, 2017, he would sit out the rest of 2017 because of the knee. (AP Photo/Kirsty Wigglesworth, File)

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FILE - In this June 9, 2017, file photo, Switzerland's Stan Wawrinka plays a shot against Britain's Andy Murray during their semifinal match of the French Open tennis tournament at Roland Garros stadium, in Paris. Roger Federer, Novak Djokovic, Rafael Nadal and Andy Murray have combined to win the past 14 Wimbledon men's titles. If someone else is going to take home the title, Wawrinka is a possible candidate. (AP Photo/Christophe Ena, File)

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Spain's Rafael Nadal bites the cup after his victory over Switzerland's Stan Wawrinka in their final match of the French Open tennis tournament at the Roland Garros stadium, Sunday, June 11, 2017 in Paris. Nadal has won his record 10th French Open title, beating No. 3 Stan Wawrinka in straight sets (AP Photo/David Vincent)

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Spain's Rafael Nadal is to kiss the trophy after defeating Switzerland's Stan Wawrinka in their final match of the French Open tennis tournament at the Roland Garros stadium, Sunday, June 11, 2017 in Paris. Nadal has won his record 10th French Open title, beating No. 3 Stan Wawrinka in straight sets (AP Photo/Michel Euler)

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Spain's Rafael Nadal lifts up the cup after defeating Switzerland's Stan Wawrinka in their final match of the French Open tennis tournament at the Roland Garros stadium, Sunday, June 11, 2017 in Paris. Nadal has won his record 10th French Open title, beating No. 3 Stan Wawrinka in straight sets (AP Photo/Michel Euler)

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Spain's Rafael Nadal holds the cup after defeating Switzerland's Stan Wawrinka in their final match of the French Open tennis tournament at the Roland Garros stadium, Sunday, June 11, 2017 in Paris. Nadal has won his record 10th French Open title, beating No. 3 Stan Wawrinka in straight sets (AP Photo/Michel Euler)

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Stan Wawrinka, of Switzerland, returns the ball to Alexander Zverev, of Germany, during the Miami Open tennis tournament, Tuesday, March 28, 2017, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

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Alexander Zverev, of Germany, returns the ball to Stan Wawrinka, of Switzerland, during the Miami Open tennis tournament, Tuesday, March 28, 2017, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

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Stan Wawrinka, of Switzerland, returns a shot from Horacio Zeballos, of Argentina, during a tennis match at the Miami Open, Saturday, March 25, 2017 in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)

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Roger Federer, of Switzerland, celebrates his 6-4, 7-5 win over Stan Wawrinka, of Switzerland, in the men's final of the BNP Paribas Open tennis tournament, Sunday, March 19, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Roger Federer, of Switzerland, poses with his trophy and the Swiss flag after defeating Stan Wawrinka, also of Switzerland, in their final match at the BNP Paribas Open tennis tournament, Sunday, March 19, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Stan Wawrinka, of Switzerland, follows through on a return to Roger Federer, of Switzerland, during the men's final at the BNP Paribas Open tennis tournament, Sunday, March 19, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Stan Wawrinka, of Switzerland, hits to Roger Federer, of Switzerland, during the men's final at the BNP Paribas Open tennis tournament, Sunday, March 19, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Roger Federer, of Switzerland, hits to Stan Wawrinka, of Switzerland, during the men's final at the BNP Paribas Open tennis tournament, Sunday, March 19, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Roger Federer, of Switzerland, celebrates his win against Stan Wawrinka, also of Switzerland, in their final match at the BNP Paribas Open tennis tournament, Sunday, March 19, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Switzerland's Stan Wawrinka celebrates scoring a point in the men's final of the French Open tennis tournament against Serbia's Novak Djokovic at the Roland Garros stadium, in Paris, France, Sunday, June 7, 2015. (AP Photo/David Vincent)

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Switzerland's Roger Federer misses a return in the quarterfinal match of the French Open tennis tournament against compatriot Stan Wawrinka who won in three sets 6-4, 6-3, 7-6 (7-4), at the Roland Garros stadium, in Paris, France, Tuesday, June 2, 2015. (AP Photo/Francois Mori)

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Switzerland’s Roger Federer celebrates winning his ATP World Tour Finals semifinal tennis match against his compatriot Stan Wawrinka at the O2 Arena in London, England, Saturday, Nov. 15, 2014. (AP Photo/Tim Ireland)