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Stefanos Tsitsipas

Stefanos Tsitsipas, of Greece, stretches out to return a shot to Borna Coric, of Croatia, during the third round of the U.S. Open tennis championships in New York.

AP Photo/Frank Franklin II

Stefanos Tsitsipas, of Greece, returns a shot to Maxime Cressy, of the United States, during the second round of the U.S. Open tennis championships in New York.

AP Photo/Frank Franklin II

Stefanos Tsitsipas, of Greece, right, taps rackets with Maxime Cressy, of the United States, after their second round of the U.S. Open tennis championships, in New York. Tsitsipas won the match.

AP Photo/Frank Franklin II

Stefanos Tsitsipas of Greece returns the ball to Alberto Lim of the Philippines during their Davis Cup World Group II play-offs first round singles match in Manila, Philippines. Tsitsipas won 6-2, 6-1.

Photo by AP/PTI

Serbia's Novak Djokovic, right, holds his winning trophy next to Stefanos Tsitsipas of Greece, after he beats him in the final match of the Dubai Duty Free Tennis Championship in Dubai, United Arab Emirates, Saturday, Feb. 29, 2020. AP/PTI(AP2_29_2020_000271B)

Photo by AP/PTI

Stefanos Tsitsipas of Greece celebrates after he won a quarter final match against Germany's Jan-Lennard Struff at the Dubai Duty Free Tennis Championship in Dubai, United Arab Emirates.

AP/PTI

Stefanos Tsitsipas of Greece makes a forehand return to Italy's Salvatore Caruso during their first round singles match at the Australian Open tennis championship in Melbourne, Australia

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From left, Roger Federer of Switzerland, Nick Kyrgios of Australia, Naomi Osaka of Japan, Alexander Zverev, Dominic Thiem of Austria, Serena Williams of the United States, Caroline Wozniacki of Denmark, Petra Kvitova of the Czech Republic, Coco Gauff of the United States, Novak Djokovic of Serbia, Stefanos Tsitsipas of Greece and Rafael Nadal of Spain pose for a photo during the Rally For Relief at Rod Laver Arena in Melbourne. Tennis stars have come together for the Rally for Relief to raise money in aid of the bushfire relief efforts across Australia.

AP/PTI

Rafael Nadal from Spain, right, stands next to Stefanos Tsitsipas of Greece, celebrates after Nadal won the final match of the Mubadala World Tennis Championship in Abu Dhabi, United Arab Emirates

Photo by AP/PTI

Stefanos Tsitsipas of Greece returns the ball to Rafael Nadal from Spain during the final match of the Mubadala World Tennis Championship in Abu Dhabi, United Arab Emirates

Photo by AP/PTI

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

Stefanos Tsitsipas of Greece celebrates after defeating Novak Djokovic of Serbia in the men's singles quarterfinals match at the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China.

AP/PTI

Stefanos Tsitsipas of Greece hits a return shot while competing against Dominic Thiem of Austria in the men's final at the China Open tennis tournament in Beijing

Photo by AP/PTI

Team Europe's Stefanos Tsitsipas, left, and teammate Roger Federer, right, play against Team World's John Isner and Jack Sock during a men's doubles tennis match at the Laver Cup tennis event in Geneva, Sunday, Sept. 22, 2019. AP/PTI(AP9_22_2019_000102B)

Photo by AP/PTI

Greece's Stefanos Tsitsipas clenches his fist after scoring a point against Switzerland's Stan Wawrinka during their fourth round match of the French Open tennis tournament at the Roland Garros stadium in Paris.

AP Photo/Christophe Ena

Serbia's Novak Djokovic, right, holds the trophy as he celebrates winning the final of the Madrid Open tennis tournament in two sets, 6-3, 6-4, against Greece's Stefanos Tsitsipas, left, in Madrid, Spain.

AP/PTI

Stefanos Tsitsipas of Greece winner, left, and Mikhail Kukushkin of Kazakhstan hold their trophies after their final match at the Open 13 Provence tennis tournament in Marseille, southern France.

AP/PTI

Spain's Rafael Nadal, right, is congratulated by Greece's Stefanos Tsitsipas after winning their semifinal at the Australian Open tennis championships in Melbourne, Australia.

AP/PTI