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![<p>
Ashleigh Barty of Australia hits a return shot while competing against Kiki Bertens of the Netherlands in their semifinal match in the China Open tennis tournament in Beijing, Saturday, Oct. 5, 2019. (AP Photo/Mark Schiefelbein)
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Daniil Medvedev, of Russia, reaches out for the ball in his match against Dominic Thiem, of Austria, during quarterfinal play at the Rogers Cup tennis tournament in Montreal, Friday, Aug. 9, 2019. (Paul Chiasson/The Canadian Press via AP)
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Dominic Thiem of Austria serves to Marin Cilic of Croatia during the Rogers Cup men’s tennis tournament Thursday, Aug. 8, 2019, in Montreal. (Paul Chiasson/The Canadian Press via AP)
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Steve Johnson from United States returns the ball to Germany's Philipp Kohlschreiber during their first round mat at the ATP tennis tournament in Halle Westphalia, Germany, Monday, June 17, 2019. (Friso Gentsch/dpa via AP)
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Amanda Anisimova of the U.S. plays a shot against Spain's Aliona Bolsova during their fourth round match of the French Open tennis tournament at the Roland Garros stadium in Paris, Monday, June 3, 2019. (AP Photo/Christophe Ena)
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Madison Keys of the U.S. celebrates winning her fourth round match of the French Open tennis tournament against Katerina Siniakova of the Czech Republic in two sets, 6-2, 6-4, at the Roland Garros stadium in Paris, Monday, June 3, 2019. (AP Photo/Pavel Golovkin)
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Switzerland's Roger Federer plays a shot against Argentina's Leonardo Mayer during their fourth round match of the French Open tennis tournament at the Roland Garros stadium in Paris, Sunday, June 2, 2019. (AP Photo/Pavel Golovkin)
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Two spectators watch a match from an adjacent court at the French Open tennis tournament at the Roland Garros stadium in Paris, Saturday, June 1, 2019. (AP Photo/Michel Euler)
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Romania's Simona Halep serves against Ukraine's Lesia Tsurenko during their third round match of the French Open tennis tournament at the Roland Garros stadium in Paris, Saturday, June 1, 2019. (AP Photo/Christophe Ena )
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Karen Khachanov of Russia returns the ball to Philipp Kohlschreiber of Germany during his round of sixteen match at the ATP tennis tournament in Munich, Germany, Thursday, May 2, 2019. (AP Photo/Matthias Schrader)
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Karen Khachanov of Russia raises the trophy after defeating Novak Djokovic of Serbia in their final match of the Paris Masters tennis tournament at the Bercy Arena in Paris, France, Sunday, Nov. 4, 2018. (AP Photo/Michel Euler)
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Karen Khachanov of Russia celebrates after defeating Dominic Thiem of Austria during their semifinal match of the Paris Masters tennis tournament at the Bercy Arena in Paris, France, Saturday, Nov. 3, 2018. (AP Photo/Thibault Camus)
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Austria's Dominic Thiem celebrates after defeating Jack Sock of the U.S. during their quarter-final match of the Paris Masters tennis tournament at the Bercy Arena in Paris, France, Friday, Nov. 2, 2018. (AP Photo/Christophe Ena)
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Karen Khachanov of Russia, right, holds the trophy after winning the final match of the Kremlin Cup tennis tournament against Adrian Mannarino of France in Moscow, Russia, Sunday, Oct. 21, 2018. (AP Photo/Pavel Golovkin)
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Elina Svitolina, of Ukraine, returns a shot to Qiang Wang, of China, during the third round of the U.S. Open tennis tournament, Friday, Aug. 31, 2018, in New York. (AP Photo/Seth Wenig)
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![Rafael Nadal of Spain celebrates winning his men's singles match against Australia's Alex de Minaur, on the sixth day of the Wimbledon Tennis Championships in London, Saturday, July 7, 2018. (AP Photo/Kirsty Wigglesworth)]()
![Switzerland's Roger Federer returns the ball to Germany's Jan-Lennard Struff during their men's singles match, on the fifth day of the Wimbledon Tennis Championships in London, Friday July 6, 2018. (AP Photo/Ben Curtis)]()
![Johanna Konta practices on the grass court at Wimbledon, ahead of the start of the 2018 Wimbledon Tennis Championships, in London Saturday June 30, 2018. Konta is scheduled to play Russian Natalia Vikhlyantseva at Wimbledon on July 3. (John Walton/PA via AP)]()
![Defending women's singles champion Garbine Muguruza of Spain waits to practice ahead of the start of the Wimbledon Tennis Championships in London Saturday, June 30, 2018. The Wimbledon Championships start upcoming Monday July 2. (AP Photo/Ben Curtis)]()
![Robin Haase from the Netherlands returns a ball to Bautista Agut from Spain during their match at the ATP tennis tournament in Halle, western Germany, Wednesday, June 20, 2018. (Friso Gentsch/dpa via AP)]()
![Argentina's Juan Martin del Potro serves against France's Julien Benneteau during their second round match of the French Open tennis tournament at the Roland Garros stadium in Paris, France, Thursday, May 31, 2018. (AP Photo/Thibault Camus)]()
Karen Khachanov
