![LONDON, ENGLAND - NOVEMBER 17: Dominic Thiem of Switzerland in action during his singles match against Milos Raonic of Canada on day five of the ATP World Tour Finals at the O2 LONDON, ENGLAND - NOVEMBER 17: Dominic Thiem of Switzerland in action during his singles match against Milos Raonic of Canada on day five of the ATP World Tour Finals at the O2](https://c8.alamy.com/comp/MN4FY5/london-england-november-17-dominic-thiem-of-switzerland-in-action-during-his-singles-match-against-milos-raonic-of-canada-on-day-five-of-the-atp-world-tour-finals-at-the-o2-arena-on-november-17-2016-in-london-england-MN4FY5.jpg)
LONDON, ENGLAND - NOVEMBER 17: Dominic Thiem of Switzerland in action during his singles match against Milos Raonic of Canada on day five of the ATP World Tour Finals at the O2
![Arena. London, UK. 16th Nov, 2019. Nitto ATP Tennis Finals; Roger Federer ( Switzerland) during his practice Arena. London, UK. 16th Nov, 2019. Nitto ATP Tennis Finals; Roger Federer ( Switzerland) during his practice](https://c8.alamy.com/comp/2A9M98T/arena-london-uk-16th-nov-2019-nitto-atp-tennis-finals-roger-federer-switzerland-during-his-practice-session-credit-action-plus-sportsalamy-live-news-credit-action-plus-sports-imagesalamy-live-news-2A9M98T.jpg)
Arena. London, UK. 16th Nov, 2019. Nitto ATP Tennis Finals; Roger Federer ( Switzerland) during his practice
Sport, Wimbledon Lawn Tennis Championships, London, England, 6th July... Nachrichtenfoto - Getty Images
![Stan Wawrinka of Switzerland gestures towards the coaches and family box of Roger Federer of Switzerland, during their semi-final tennis match at the ATP World Tour Finals at the O2 Arena in Stan Wawrinka of Switzerland gestures towards the coaches and family box of Roger Federer of Switzerland, during their semi-final tennis match at the ATP World Tour Finals at the O2 Arena in](https://c8.alamy.com/compfr/2e69x69/stan-wawrinka-of-switzerland-gestures-towards-the-coaches-and-family-box-of-roger-federer-of-switzerland-during-their-semi-final-tennis-match-at-the-atp-world-tour-finals-at-the-o2-arena-in-london-november-15-2014-switzerlands-potential-davis-cup-fairytale-this-weekend-has-become-clouded-by-uncertainty-over-the-fitness-of-federer-and-suggestions-of-strained-relations-between-the-all-time-great-and-his-team-mate-wawrinka-not-only-did-the-draining-final-moments-of-federers-win-at-the-atp-tour-finals-semi-final-against-wawrinka-reawaken-his-old-back-trouble-forcing-him-to-withdraw-before-s-2e69x69.jpg)
Stan Wawrinka of Switzerland gestures towards the coaches and family box of Roger Federer of Switzerland, during their semi-final tennis match at the ATP World Tour Finals at the O2 Arena in
![Roger Federer, Federer, Switzerland, Europe, tennis player, tennis, player, match, sports, man, Stock Photo, Picture And Rights Managed Image. Pic. H44-10826533 | agefotostock Roger Federer, Federer, Switzerland, Europe, tennis player, tennis, player, match, sports, man, Stock Photo, Picture And Rights Managed Image. Pic. H44-10826533 | agefotostock](https://t1.thpservices.com/previewimage/gallil/bff176cfa3e7d35f5581d16ca733059a/pah-190715-99-66789-dpai.jpg)
Roger Federer, Federer, Switzerland, Europe, tennis player, tennis, player, match, sports, man, Stock Photo, Picture And Rights Managed Image. Pic. H44-10826533 | agefotostock
![Tennis - Barclays ATP World Tour Final's - O2 Arena - London - 28/11/10 Roger Federer - Switzerland celebrates Mandatory Credit: Action Images / Tony O'Brien Stock Photo - Alamy Tennis - Barclays ATP World Tour Final's - O2 Arena - London - 28/11/10 Roger Federer - Switzerland celebrates Mandatory Credit: Action Images / Tony O'Brien Stock Photo - Alamy](https://c8.alamy.com/comp/2EHRJB9/tennis-barclays-atp-world-tour-finals-o2-arena-london-281110-roger-federer-switzerland-celebrates-mandatory-credit-action-images-tony-obrien-2EHRJB9.jpg)