Highlights of ATP Finals tennis tournament

Jannik Sinner hits a return during the group stage match between Jannik Sinner of Italy and Holger Rune of Denmark at ATP Finals tennis tournament in Turin, Italy, Nov. 16, 2023. (Photo by Alberto Lingria/Xinhua)

Novak Djokovic hits a return during the group stage match between Novak Djokovic of Serbia and Hubert Hurkacz of Poland at ATP Finals tennis tournament in Turin, Italy, Nov. 16, 2023. (Photo by Alberto Lingria/Xinhua)

Novak Djokovic hits a return during the group stage match between Novak Djokovic of Serbia and Hubert Hurkacz of Poland at ATP Finals tennis tournament in Turin, Italy, Nov. 16, 2023. (Photo by Alberto Lingria/Xinhua)

Novak Djokovic hits a return during the group stage match between Novak Djokovic of Serbia and Hubert Hurkacz of Poland at ATP Finals tennis tournament in Turin, Italy, Nov. 16, 2023. (Photo by Alberto Lingria/Xinhua)

Holger Rune hits a return during the group stage match between Jannik Sinner of Italy and Holger Rune of Denmark at ATP Finals tennis tournament in Turin, Italy, Nov. 16, 2023. (Photo by Alberto Lingria/Xinhua)

Hubert Hurkacz serves during the group stage match between Novak Djokovic of Serbia and Hubert Hurkacz of Poland at ATP Finals tennis tournament in Turin, Italy, Nov. 16, 2023. (Photo by Alberto Lingria/Xinhua)

Holger Rune hits a return during the group stage match between Jannik Sinner of Italy and Holger Rune of Denmark at ATP Finals tennis tournament in Turin, Italy, Nov. 16, 2023. (Photo by Alberto Lingria/Xinhua)

Novak Djokovic serves during the group stage match between Novak Djokovic of Serbia and Hubert Hurkacz of Poland at ATP Finals tennis tournament in Turin, Italy, Nov. 16, 2023. (Photo by Alberto Lingria/Xinhua)

Novak Djokovic hits a return during the group stage match between Novak Djokovic of Serbia and Hubert Hurkacz of Poland at ATP Finals tennis tournament in Turin, Italy, Nov. 16, 2023. (Photo by Alberto Lingria/Xinhua)