![Serbia's Novak Djokovic celebrates beating Switzerland's Roger Federer in their final tennis match at the ATP World Tour Finals at the O2 Arena in London November 12, 2012. Djokovic cemented his place Serbia's Novak Djokovic celebrates beating Switzerland's Roger Federer in their final tennis match at the ATP World Tour Finals at the O2 Arena in London November 12, 2012. Djokovic cemented his place](https://c8.alamy.com/comp/2D01P1R/serbias-novak-djokovic-celebrates-beating-switzerlands-roger-federer-in-their-final-tennis-match-at-the-atp-world-tour-finals-at-the-o2-arena-in-london-november-12-2012-djokovic-cemented-his-place-as-the-number-one-in-tennis-when-he-beat-federer-7-6-7-5-to-win-the-atp-world-tour-finals-crown-on-monday-reutersdylan-martinez-britain-tags-sport-tennis-2D01P1R.jpg)
Serbia's Novak Djokovic celebrates beating Switzerland's Roger Federer in their final tennis match at the ATP World Tour Finals at the O2 Arena in London November 12, 2012. Djokovic cemented his place
![Rafael Nadal still loves London despite concerns about ATP World Tour Finals | Tennis News | ESPN.co.uk Rafael Nadal still loves London despite concerns about ATP World Tour Finals | Tennis News | ESPN.co.uk](http://en.espn.co.uk/PICTURES/CMS/57400/57491.3.jpg)
Rafael Nadal still loves London despite concerns about ATP World Tour Finals | Tennis News | ESPN.co.uk
![Arena. London, UK. 16th Nov, 2019. Nitto ATP Tennis Finals; Roger Federer (SUI) plays a forehand shot in his match against Stefanos Tsitsipas (GRE) - Editorial Use Credit: Action Plus Sports Images/Alamy Arena. London, UK. 16th Nov, 2019. Nitto ATP Tennis Finals; Roger Federer (SUI) plays a forehand shot in his match against Stefanos Tsitsipas (GRE) - Editorial Use Credit: Action Plus Sports Images/Alamy](https://c8.alamy.com/comp/2A9MJ9B/arena-london-uk-16th-nov-2019-nitto-atp-tennis-finals-roger-federer-sui-plays-a-forehand-shot-in-his-match-against-stefanos-tsitsipas-gre-editorial-use-credit-action-plus-sports-imagesalamy-live-news-2A9MJ9B.jpg)
Arena. London, UK. 16th Nov, 2019. Nitto ATP Tennis Finals; Roger Federer (SUI) plays a forehand shot in his match against Stefanos Tsitsipas (GRE) - Editorial Use Credit: Action Plus Sports Images/Alamy
![ATP Finals players confirmed: Federer, Nadal and Djokovic star in London | Tennis | Sport | Express.co.uk ATP Finals players confirmed: Federer, Nadal and Djokovic star in London | Tennis | Sport | Express.co.uk](https://cdn.images.express.co.uk/img/dynamic/72/590x/ATP-Finals-players-1198957.jpg?r=1572644653990)