![Germany's Mischa Zverev returns a shot to Slovakia's Lukas Lacko at the Gerry Weber Open ATP tennis tournament in Halle, Germany, Tuesday, June 20, 2017. (Friso Gentsch/dpa via AP Stock Photo - Alamy Germany's Mischa Zverev returns a shot to Slovakia's Lukas Lacko at the Gerry Weber Open ATP tennis tournament in Halle, Germany, Tuesday, June 20, 2017. (Friso Gentsch/dpa via AP Stock Photo - Alamy](https://c8.alamy.com/comp/2NYN4J5/germanys-mischa-zverev-returns-a-shot-to-slovakias-lukas-lacko-at-the-gerry-weber-open-atp-tennis-tournament-in-halle-germany-tuesday-june-20-2017-friso-gentschdpa-via-ap-2NYN4J5.jpg)
Germany's Mischa Zverev returns a shot to Slovakia's Lukas Lacko at the Gerry Weber Open ATP tennis tournament in Halle, Germany, Tuesday, June 20, 2017. (Friso Gentsch/dpa via AP Stock Photo - Alamy
![Czech Tomas Berdych serves during the third round match against Germany's Rainer Schuettler at the MercedesCup ATP tennis tournament at the Weissenhof in Stuttgart, southern Germany, on Thursday, July 21, 2005. (AP Czech Tomas Berdych serves during the third round match against Germany's Rainer Schuettler at the MercedesCup ATP tennis tournament at the Weissenhof in Stuttgart, southern Germany, on Thursday, July 21, 2005. (AP](https://c8.alamy.com/comp/2PE10WP/czech-tomas-berdych-serves-during-the-third-round-match-against-germanys-rainer-schuettler-at-the-mercedescup-atp-tennis-tournament-at-the-weissenhof-in-stuttgart-southern-germany-on-thursday-july-21-2005-ap-photodaniel-maurer-2PE10WP.jpg)
Czech Tomas Berdych serves during the third round match against Germany's Rainer Schuettler at the MercedesCup ATP tennis tournament at the Weissenhof in Stuttgart, southern Germany, on Thursday, July 21, 2005. (AP
![France's Richard Gasquet returns the ball to Greece's Stefanos Tsitsipas during their round of sixteen tennis match at the ATP tennis tournament in Stuttgart, Germany, Thursday, June 15, 2023. (Marijan Murat/dpa via France's Richard Gasquet returns the ball to Greece's Stefanos Tsitsipas during their round of sixteen tennis match at the ATP tennis tournament in Stuttgart, Germany, Thursday, June 15, 2023. (Marijan Murat/dpa via](https://c8.alamy.com/comp/2R7FR49/frances-richard-gasquet-returns-the-ball-to-greeces-stefanos-tsitsipas-during-their-round-of-sixteen-tennis-match-at-the-atp-tennis-tournament-in-stuttgart-germany-thursday-june-15-2023-marijan-muratdpa-via-ap-2R7FR49.jpg)
France's Richard Gasquet returns the ball to Greece's Stefanos Tsitsipas during their round of sixteen tennis match at the ATP tennis tournament in Stuttgart, Germany, Thursday, June 15, 2023. (Marijan Murat/dpa via
![Germany's Tomas Behrend returns a forehand to his Chilean opponent Fernando Gonzales during their quarterfinal match of the Mercedes Cup ATP tennis tournament at the Weissenhof in Stuttgart, southern Germany, on Friday, Germany's Tomas Behrend returns a forehand to his Chilean opponent Fernando Gonzales during their quarterfinal match of the Mercedes Cup ATP tennis tournament at the Weissenhof in Stuttgart, southern Germany, on Friday,](https://c8.alamy.com/comp/2PF6171/germanys-tomas-behrend-returns-a-forehand-to-his-chilean-opponent-fernando-gonzales-during-their-quarterfinal-match-of-the-mercedes-cup-atp-tennis-tournament-at-the-weissenhof-in-stuttgart-southern-germany-on-friday-july-18-2003-ap-photodaniel-maurer-2PF6171.jpg)
Germany's Tomas Behrend returns a forehand to his Chilean opponent Fernando Gonzales during their quarterfinal match of the Mercedes Cup ATP tennis tournament at the Weissenhof in Stuttgart, southern Germany, on Friday,
![Daniel Brands from Germany plays a ball back to Potito Starace from Italy during their match at the BMW Open ATP tennis tournament in Munich, southern Germany, Friday, May 8, 2009. (AP Daniel Brands from Germany plays a ball back to Potito Starace from Italy during their match at the BMW Open ATP tennis tournament in Munich, southern Germany, Friday, May 8, 2009. (AP](https://c8.alamy.com/comp/2P8GBY2/daniel-brands-from-germany-plays-a-ball-back-to-potito-starace-from-italy-during-their-match-at-the-bmw-open-atp-tennis-tournament-in-munich-southern-germany-friday-may-8-2009-ap-photouwe-lein-2P8GBY2.jpg)