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ATP Finals

Dominic Thiem of Austria serves to Daniil Medvedev of Russia during their singles final tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

AP Photo/Frank Augstein

Dominic Thiem of Austria celebrates winning a point against Daniil Medvedev of Russia during their singles final tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

AP Photo/Frank Augstein

Daniil Medvedev of Russia plays a return to Dominic Thiem of Austria during their singles final tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

AP Photo/Frank Augstein

Dominic Thiem of Austria reacts as he wins the first set against Daniil Medvedev of Russia during their singles final tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

AP Photo/Frank Augstein

Daniil Medvedev of Russia plays a return to Dominic Thiem of Austria during their singles final tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

AP Photo/Frank Augstein

Daniil Medvedev of Russia holds up the winners trophy after defeating Dominic Thiem of Austria in the final of the ATP World Finals tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

AP Photo/Frank Augstein

Daniil Medvedev of Russia, right, holds up the winners trophy after defeating Dominic Thiem of Austria, left, in the final of the ATP World Finals tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

AP Photo/Frank Augstein

Daniil Medvedev of Russia holds up the winners trophy as confetti falls after defeating Dominic Thiem of Austria in the final of the ATP World Finals tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

Photo by AP/PTI

Wesley Koolhof of the Netherlands, left, and Nikola Mektic of Croatia, right, hold up the trophy after winning against Jurgen Melzer of Austria and Edouard Roger-Vasselin of France during their doubles final tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

Photo by AP/PTI

Wesley Koolhof of the Netherlands, left, and Nikola Mektic of Croatia, right, celebrate as they win match point against Jurgen Melzer of Austria and Edouard Roger-Vasselin of France during their doubles final tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

Photo by AP/PTI

Novak Djokovic of Serbia serves the ball during the semifinal match against Dominic Thiem of Austria at the ATP World Finals tennis tournament at the O2 arena in London.

AP Photo/Frank Augstein

Dominic Thiem of Austria serves the ball during the semifinal match against Novak Djokovic of Serbia at the ATP World Finals tennis tournament at the O2 arena in London.

AP Photo/Frank Augstein

Novak Djokovic of Serbia returns the ball to Dominic Thiem of Austria during their semifinal match at the ATP World Finals tennis tournament at the O2 arena in London.

AP Photo/Frank Augstein

Dominic Thiem of Austria reacts during the semifinal match against Novak Djokovic of Serbia at the ATP World Finals tennis tournament at the O2 arena in London.

AP Photo/Frank Augstein

Novak Djokovic of Serbia juggles with his racket during the semifinal match against Dominic Thiem of Austria at the ATP World Finals tennis tournament at the O2 arena in London.

AP Photo/Frank Augstein

Dominic Thiem of Austria celebrates after winning his semifinal match against Novak Djokovic of Serbia at the ATP World Finals tennis tournament at the O2 arena in London. Thiem beat the top-ranked Djokovic 7-5, 6-7 (10), 7-6 (5).

AP Photo/Frank Augstein

Novak Djokovic of Serbia leaves after losing his semifinal match against Dominic Thiem of Austria at the ATP World Finals tennis tournament at the O2 arena in London.

AP Photo/Frank Augstein

Novak Djokovic of Serbia, left, shakes hands with Dominic Thiem of Austria at the end of their semifinal match ATP World Finals tennis tournament at the O2 arena in London. Thiem beat the top-ranked Djokovic 7-5, 6-7 (10), 7-6 (5).

AP Photo/Frank Augstein

Rafael Nadal of Spain celebrates after winning a point during the semifinal match against Daniil Medvedev of Russia at the ATP World Finals tennis tournament at the O2 arena in London

Photo by AP/PTI

Wesley Koolhof of the Netherlands, left, celebrates with Nikola Mektic of Croatia as they play against Marcel Granollers of Spain and Horacio Zeballos of Argentina in the double semifinal match at the ATP World Finals tennis tournament at the O2 arena in London.

Photo by AP/PTI

Novak Djokovic of Serbia returns the ball to Dominic Thiem of Austria during their semifinal match at the ATP World Finals tennis tournament at the O2 arena in London

Photo by AP/PTI

Jurgen Melzer of Austria, right, and Edouard Roger-Vasselin of France, left, play a return to Marcel Granollers of Spain and Horacio Zeballos of Argentina during their doubles tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

AP/PTI

Rafael Nadal of Spain serves to Stefanos Tsitsipas of Greece during their tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

AP Photo/Frank Augstein

Rafael Nadal of Spain reacts after losing a point to Stefanos Tsitsipas of Greece during their tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

AP Photo/Frank Augstein

Diego Schwartzman of Argentina tries to teach the ballgestures after a winning point as he plays against Alexander Zverev of Germany during their tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

Photo by AP/PTI

Diego Schwartzman of Argentina plays a return to Alexander Zverev of Germany during their tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

Photo by AP/PTI

Stefanos Tsitsipas of Greece celebrates winning match point against Andrey Rublev of Russia during their singles tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

Photo by AP/PTI

Kevin Krawietz of Germany, front, and Andreas Mies of Germany, behind, play a return to Lukasz Kubot of Poland and Marcelo Melo of Brazil during their doubles tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

Photo by AP/PTI

Dominic Thiem of Austria celebrates winning the first set against Rafael Nadal of Spain during their singles tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

Photo by AP/PTI

Rafael Nadal of Spain serves to Dominic Thiem of Austria during their singles tennis match at the ATP World Finals tennis tournament at the O2 arena in London

Photo by AP/PTI

Novak Djokovic of Serbia plays a return to Diego Schwartzman of Argentina during their singles tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

AP Photo/Frank Augstein

Novak Djokovic of Serbia plays a return to Diego Schwartzman of Argentina during their singles tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

Photo by AP/PTI

Joe Sailsbury, left, and Rajeev Ram during their doubles match against Lukasz Kubot and Marcelo Melo on day one of the ATP Finals tennis championship at The O2 Arena, London.

Photo by AP/PTI

Naomi Osaka of Japan plays a shot during her match against Maria Sakkari of Greece at the Brisbane International tennis tournament in Brisbane, Australia.

AP/PTI

Thick, honeyed blond locks whose unruliness have to be managed frequently; chiselled features where adulthood fig­hts childlike inn­ocence; a phy­­sique to ins­p­ire Renaissa­nce art—anyone would be happy with this. Not Alexander Zverev. he had to go and beat Federer and Djok­o­­vic, on consecutive days at the ATP Fin­­als, without dropping a set. Unbeliev­a­ble? That’s how a next-gen superstar is made.

Novak Djokovic of Serbia holds his runner-up trophy after lost the ATP World Tour Finals singles final tennis match against Alexander Zverev of Germany at the O2 Arena in London.

AP Photo/Tim Ireland

Alexander Zverev of Germany kisses the trophy after defeating Novak Djokovic of Serbia, right, in their ATP World Tour Finals singles final tennis match at the O2 Arena in London.

AP Photo/Tim Ireland

Alexander Zverev of Germany holds up the trophy after defeating Novak Djokovic of Serbia in their ATP World Tour Finals singles final tennis match at the O2 Arena in London.

AP Photo/Tim Ireland

Alexander Zverev of Germany plays a return to John Isner of the United States in their ATP World Tour Finals singles tennis match at the O2 Arena in London.

AP Photo/Tim Ireland

Novak Djokovic, of Serbia, plays a return to Marin Cilic, of Croatia, during their ATP World Tour Finals singles tennis match at the O2 Arena in London.

AP Photo/Tim Ireland

Novak Djokovic of Serbia celebrates after defeating Alexander Zverev of Germany in their ATP World Tour Finals men's singles tennis match at the O2 arena in London.

AP/PTI

Roger Federer of Switzerland plays a return to Dominic Thiem of Austria during their ATP World Tour Finals men's singles tennis match at the O2 arena in London.

AP/PTI

Croatia's Marin Cilic returns to Alexander Zverev during the ATP Men's Singles Final, at The O2 Arena in London. Cilic made 46 unforced errors as he gave up a break advantage in both sets in losing to Alexander Zverev.

AP/PTI

Novak Djokovic of Serbia celebrates winning a point against John Isner of the United States in their ATP World Tour Finals tennis match at the O2 Arena in London.

AP/PTI