![Rotterdam, The Netherlands. 02nd Mar, 2021. ROTTERDAM, THE NETHERLANDS - MARCH 2: Stan Wawrinka of Switzerland during his match against Karen Khachanov of Russia during the 48e ABN AMRO World Tennis Tournament Rotterdam, The Netherlands. 02nd Mar, 2021. ROTTERDAM, THE NETHERLANDS - MARCH 2: Stan Wawrinka of Switzerland during his match against Karen Khachanov of Russia during the 48e ABN AMRO World Tennis Tournament](https://c8.alamy.com/comp/2EW80X0/rotterdam-the-netherlands-02nd-mar-2021-rotterdam-the-netherlands-march-2-stan-wawrinka-of-switzerland-during-his-match-against-karen-khachanov-of-russia-during-the-48e-abn-amro-world-tennis-tournament-at-rotterdam-ahoy-on-march-2-2021-in-rotterdam-the-netherlands-photo-by-henk-seppenorange-pictures-credit-orange-pics-bvalamy-live-news-2EW80X0.jpg)
Rotterdam, The Netherlands. 02nd Mar, 2021. ROTTERDAM, THE NETHERLANDS - MARCH 2: Stan Wawrinka of Switzerland during his match against Karen Khachanov of Russia during the 48e ABN AMRO World Tennis Tournament
![Doha, Qatar. 1st Jan, 2019. Stan Wawrinka of Switzerland returns the ball during the singles first round match against Karen Khachanov of Russia at the ATP Qatar Open Tennis match in Doha, Doha, Qatar. 1st Jan, 2019. Stan Wawrinka of Switzerland returns the ball during the singles first round match against Karen Khachanov of Russia at the ATP Qatar Open Tennis match in Doha,](https://c8.alamy.com/comp/RA6AED/doha-qatar-1st-jan-2019-stan-wawrinka-of-switzerland-returns-the-ball-during-the-singles-first-round-match-against-karen-khachanov-of-russia-at-the-atp-qatar-open-tennis-match-in-doha-capital-of-qatar-jan-1-2019-credit-nikkuxinhuaalamy-live-news-RA6AED.jpg)
Doha, Qatar. 1st Jan, 2019. Stan Wawrinka of Switzerland returns the ball during the singles first round match against Karen Khachanov of Russia at the ATP Qatar Open Tennis match in Doha,
![Rotterdam, The Netherlands. 02nd Mar, 2021. ROTTERDAM, THE NETHERLANDS - MARCH 2: Stan Wawrinka of Switzerland during his match against Karen Khachanov of Russia during the 48e ABN AMRO World Tennis Tournament Rotterdam, The Netherlands. 02nd Mar, 2021. ROTTERDAM, THE NETHERLANDS - MARCH 2: Stan Wawrinka of Switzerland during his match against Karen Khachanov of Russia during the 48e ABN AMRO World Tennis Tournament](https://c8.alamy.com/comp/2EW822P/rotterdam-the-netherlands-02nd-mar-2021-rotterdam-the-netherlands-march-2-stan-wawrinka-of-switzerland-during-his-match-against-karen-khachanov-of-russia-during-the-48e-abn-amro-world-tennis-tournament-at-rotterdam-ahoy-on-march-2-2021-in-rotterdam-the-netherlands-photo-by-henk-seppenorange-pictures-credit-orange-pics-bvalamy-live-news-2EW822P.jpg)
Rotterdam, The Netherlands. 02nd Mar, 2021. ROTTERDAM, THE NETHERLANDS - MARCH 2: Stan Wawrinka of Switzerland during his match against Karen Khachanov of Russia during the 48e ABN AMRO World Tennis Tournament
![Doha, Qatar. 1st Jan, 2019. Karen Khachanov of Russia serves during the singles first round match against Stan Wawrinka of Switzerland at the ATP Qatar Open Tennis match in Doha, capital of Doha, Qatar. 1st Jan, 2019. Karen Khachanov of Russia serves during the singles first round match against Stan Wawrinka of Switzerland at the ATP Qatar Open Tennis match in Doha, capital of](https://c8.alamy.com/comp/RA6AEJ/doha-qatar-1st-jan-2019-karen-khachanov-of-russia-serves-during-the-singles-first-round-match-against-stan-wawrinka-of-switzerland-at-the-atp-qatar-open-tennis-match-in-doha-capital-of-qatar-jan-1-2019-credit-nikkuxinhuaalamy-live-news-RA6AEJ.jpg)
Doha, Qatar. 1st Jan, 2019. Karen Khachanov of Russia serves during the singles first round match against Stan Wawrinka of Switzerland at the ATP Qatar Open Tennis match in Doha, capital of
![ROTTERDAM, THE NETHERLANDS - MARCH 2: Karen Khachanov of Russia during his match against Stan Wawrinka of Switzerland during the 48e ABN AMRO World Te Stock Photo - Alamy ROTTERDAM, THE NETHERLANDS - MARCH 2: Karen Khachanov of Russia during his match against Stan Wawrinka of Switzerland during the 48e ABN AMRO World Te Stock Photo - Alamy](https://c8.alamy.com/comp/2EW808D/rotterdam-the-netherlands-march-2-karen-khachanov-of-russia-during-his-match-against-stan-wawrinka-of-switzerland-during-the-48e-abn-amro-world-te-2EW808D.jpg)
ROTTERDAM, THE NETHERLANDS - MARCH 2: Karen Khachanov of Russia during his match against Stan Wawrinka of Switzerland during the 48e ABN AMRO World Te Stock Photo - Alamy
![Perth, Australia. 2nd Jan, 2018. Karen Khachanov (R) of Russia shakes hands with Roger Federer of Switzerland during the match between Switzerland and Russia at Hopman Cup mixed teams tennis tournament in Perth, Australia. 2nd Jan, 2018. Karen Khachanov (R) of Russia shakes hands with Roger Federer of Switzerland during the match between Switzerland and Russia at Hopman Cup mixed teams tennis tournament in](https://c8.alamy.com/comp/KWANDJ/perth-australia-2nd-jan-2018-karen-khachanov-r-of-russia-shakes-hands-KWANDJ.jpg)
Perth, Australia. 2nd Jan, 2018. Karen Khachanov (R) of Russia shakes hands with Roger Federer of Switzerland during the match between Switzerland and Russia at Hopman Cup mixed teams tennis tournament in
![Roger Federer: Karen Khachanov refuses to jump on Swiss star's bandwagon | Tennis | Sport | Express.co.uk Roger Federer: Karen Khachanov refuses to jump on Swiss star's bandwagon | Tennis | Sport | Express.co.uk](https://cdn.images.express.co.uk/img/dynamic/72/590x/Roger-Federer-940455.jpg)