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ATP World Tour

Stefanos Tsitsipas of Greece holds up the trophy and celebrates with the ball kids after defeating Austria's Dominic Thiem in the final of the ATP World Finals tennis match at the O2 arena in London

Photo by AP/PTI

Stefanos Tsitsipas of Greece holds up the trophy and celebrates after defeating Austria's Dominic Thiem in the final of the ATP World Finals tennis match at the O2 arena in London

Photo by AP/PTI

Pierre-Hugues Herbert of France, right, and Nicholas Mahut of France kiss trophy they have won after defeating Raven Klaasen of South Africa and Michael Venus of New Zealand following their ATP World Finals final doubles tennis match at the O2 arena in London

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Germany's Alexander Zverev celebrates after defeating Russia's Daniil Medvedev in their ATP World Tours Finals singles tennis match at the O2 Arena in London

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Spain's Rafael Nadal lifts the ATP World Number 1 trophy following the presentation on court after his match against Stefanos Tsitsipas of Greece at the ATP World Tours Finals in the O2 Arena in London

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Spain's Rafael Nadal plays a return to Stefanos Tsitsipas of Greece during their ATP World Tours Finals singles tennis match at the O2 Arena in London

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Roger Federer of Switzerland celebrates the winning match point against Novak Djokovic of Serbia during their ATP World Tour Finals singles tennis match at the O2 Arena in London.

AP/PTI

Juan Sebastian Cabal, left and Robert Farah of Colombia receive the award as World doubles No 1 during the ATP World Tour Finals at the O2 Arena in London.

AP/PTI

Rafael Nadal of Spain celebrate after winning match point against Daniil Medvedev of Russia during their ATP World Tour Finals singles tennis match at the O2 Arena in London.

AP/PTI

Rafael Nadal of Spain reacts after winning a point against Daniil Medvedev of Russia during their ATP World Tour Finals singles tennis match at the O2 Arena in London.

AP/PTI

Switzerland's Roger Federer, right, shakes hands with Italy's Matteo Berrettini after defeating him in their their ATP World Tour Finals singles tennis match at the O2 Arena in London.

AP/PTI

Serbia's Novak Djokovic plays a return to Austria's Dominic Thiem during their ATP World Tour Finals singles tennis match at the O2 Arena in London.

Daniil Medvedev of Russia returns to Stefanos Tsitsipas of Greece, during their ATP World Tour Finals singles tennis match at the O2 Arena in London.

Photo by AP/PTI

Switzerland's Roger Federer talks to the umpire as he plays against Austria's Dominic Thiem during their ATP World Tour Finals singles tennis match at the O2 Arena in London

Photo by AP/PTI

Serbia's Novak Djokovic plays a return to Italy's Matteo Berrettini during their ATP World Tour Finals singles tennis match at the O2 Arena in London

Photo by AP/PTI