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![<p>
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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![<p>
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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![<p>
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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![<p>
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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![<p>
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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![<p>
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)]()
![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)]()
![Lucas Pouille of France returns the ball to Karen Khachanov of Russia during the Dubai Duty Free Tennis Championship in Dubai, United Arab Emirates, Wednesday, Feb. 28, 2018. (AP Photo/Kamran Jebreili)]()
![Karen Khachanov of Russia kisses his trophy after defeating Lucas Pouille of France during their final match at the Open 13 Provence tennis tournament in Marseille, southern France, Sunday Feb.25, 2018.(AP Photo/Claude Paris)]()
![Russia's Karen Khachanov makes a forehand return to Argentina's Juan Martin del Potro during their second round match at the Australian Open tennis championships in Melbourne, Australia, Thursday, Jan. 18, 2018. (AP Photo/Dita Alangkara)]()
![ATP President Chris Kermode smiles during a press conference to present the ATP Next Gen Finals tennis tournament, in Milan, Italy, Monday, Nov. 6, 2017. Organizers apologized Monday for a ceremony involving female models provocatively revealing the letters "A'' or "B'' to determine the draw for the ATP's Next Gen Finals tennis tournament. The ceremony on Sunday was supposed to highlight Milan's status in the fashion industry. (AP Photo/Luca Bruno)]()
Karen Khachanov
