Jannik Sinner of Italy in action during the Round Robin singles match between Jannik Sinner of Italy and Stefanos Tsitsipas of Greece on Day One of...
General view of the O2 Arena court during the singles group B match between Andy Murray of Great Britain and Kei Nishikori of Japan on the first day...
Novak Djokovic of Serbia celebrates at the end of the Round Robin singles match between Novak Djokovic of Serbia and Holger Rune of Denmark on Day...
Germany's Alexander Zverev holds up the trophy after beating Serbia's Novak Djokovic in their men's singles final match on day eight of the ATP World...
Andy Murray of Great Britain poses with the year end World number one trophy following his victory during the Singles Final against Novak Djokovic of...
One Direction's Niall Horan watches Serbia's Novak Djokovic play against Spain's Rafael Nadal during the singles final on the eighth day of the ATP...
Novak Djokovic of Serbia celebrates at the end of the Round Robin singles match between Novak Djokovic of Serbia and Holger Rune of Denmark on Day...
Jannik Sinner of Italy in action during the Round Robin singles match between Jannik Sinner of Italy and Stefanos Tsitsipas of Greece on Day One of...
Novak Djokovic of Serbia celebrates at the end of the Round Robin singles match between Novak Djokovic of Serbia and Holger Rune of Denmark on Day...
Jannik Sinner of Italy celebrates during the Round Robin singles match between Jannik Sinner of Italy and Stefanos Tsitsipas of Greece on Day One of...
Rory McIlroy of Northern Ireland poses with the Harry Vardon Trophy for the European number one with his caddie Harry Diamond and his business...
Former Brazilian tennis player Gustavo Kuerten is flanked by Germany's Alexander Zverev and Serbia's Novak Djokovic as they pose with their trophies...
Germany's Alexander Zverev holds up the trophy after beating Serbia's Novak Djokovic in their men's singles final match on day eight of the ATP World...
Roger Federer of Switzerland and Tournament Director Edwin Weindorfer with a presentation for regaining the world number one title after his...
Roger Federer of Switzerland and Tournament Director Edwin Weindorfer with a presentation for regaining the world number one title after his...
Roger Federer of Switzerland and the ball kids with a presentation for regaining the world number one title after his Semi-Finals match win against...
Roger Federer of Switzerland with fans after his Semi-Finals match win against Nick Kyrgios of Australia at Mercedes Cup, regaining the world number...
Roger Federer of Switzerland and the ball kids with a presentation for regaining the world number one title after his Semi-Finals match win against...
Roger Federer of Switzerland and the ball kids with a presentation for regaining the world number one title after his Semi-Finals match win against...
Roger Federer of Switzerland and Tournament Director Edwin Weindorfer with a presentation for regaining the world number one title after his...
Roger Federer of Switzerland and Tournament Director Edwin Weindorfer with a presentation for regaining the world number one title after his...
Roger Federer of Switzerland and the ball kids with a presentation for regaining the world number one title after his Semi-Finals match win against...
Roger Federer of Switzerland and Tournament Director Edwin Weindorfer with a presentation for regaining the world number one title after his...
Roger Federer of Switzerland and Tournament Director Edwin Weindorfer with a presentation for regaining the world number one title after his...
Roger Federer of Switzerland with fans after his Semi-Finals match win against Nick Kyrgios of Australia at Mercedes Cup, regaining the world number...
Roger Federer of Switzerland and Tournament Director Edwin Weindorfer with a presentation for regaining the world number one title after his...
Roger Federer of Switzerland and Tournament Director Edwin Weindorfer with a presentation for regaining the world number one title after his...
Roger Federer of Switzerland and Tournament Director Edwin Weindorfer with a presentation for regaining the world number one title after his...
Roger Federer of Switzerland and Tournament Director Edwin Weindorfer with a presentation for regaining the world number one title after his...
Fernando Verdasco of Spain serves during the men's singles first round match against Roger Federer of Switzerland during the Barclays ATP World Tour...
Roger Federer of Switzerland serves the ball during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP...
Roger Federer of Switzerland celebrates the match during the men's singles first round match against Fernando Verdasco of Spain during the Barclays...
Roger Federer of Switzerland serves the ball during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP...
Roger Federer of Switzerland celebrates the match during the men's singles first round match against Fernando Verdasco of Spain during the Barclays...
Roger Federer of Switzerland reacts during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP World Tour...
Fernando Verdasco of Spain reacts during the men's singles first round match against Roger Federer of Switzerland during the Barclays ATP World Tour...
Roger Federer of Switzerland reacts during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP World Tour...
Roger Federer of Switzerland returns the ball during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP...
Roger Federer of Switzerland reacts during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP World Tour...
Fernando Verdasco of Spain reacts during the men's singles first round match against Roger Federer of Switzerland during the Barclays ATP World Tour...
Fernando Verdasco of Spain returns the ball during the men's singles first round match against Roger Federer of Switzerland during the Barclays ATP...
Fernando Verdasco of Spain reacts during the men's singles first round match against Roger Federer of Switzerland during the Barclays ATP World Tour...
Roger Federer of Switzerland returns the ball during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP...
Roger Federer of Switzerland returns the ball during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP...
Roger Federer of Switzerland serves the ball during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP...
Roger Federer of Switzerland serves the ball during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP...
Roger Federer of Switzerland returns the ball during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP...
Roger Federer of Switzerland returns the ball during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP...
Fernando Verdasco of Spain returns the ball during the men's singles first round match against Roger Federer of Switzerland during the Barclays ATP...
Fernando Verdasco of Spain returns the ball during the men's singles first round match against Roger Federer of Switzerland during the Barclays ATP...
Roger Federer of Switzerland returns the ball during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP...
Roger Federer of Switzerland returns the ball during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP...
Roger Federer of Switzerland returns the ball during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP...
Fernando Verdasco of Spain returns the ball during the men's singles first round match against Roger Federer of Switzerland during the Barclays ATP...
Roger Federer of Switzerland reacts during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP World Tour...
Fernando Verdasco of Spain reacts during the men's singles first round match against Roger Federer of Switzerland during the Barclays ATP World Tour...
Roger Federer of Switzerland returns the ball during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP...
Roger Federer of Switzerland serves the ball during the men's singles first round match against Fernando Verdasco of Spain during the Barclays ATP...
Fernando Verdasco of Spain returns the ball during the men's singles first round match against Roger Federer of Switzerland during the Barclays ATP...
Fernando Verdasco of Spain returns the ball during the men's singles first round match against Roger Federer of Switzerland during the Barclays ATP...