Stefanos Tsitsipas

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. Ts...

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 D...

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 Emi...

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, Aus...

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...

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, Unit...

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

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 ...

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

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 Fores...

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

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 t...

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 ...

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,...

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, s...

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.