India's Kamal Achanta speaks to his coach after winning the table tennis men's singles second round match against Portugal's Tiago Apolonia at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

India's Kamal Achanta competes during the table tennis men's singles second round match against Portugal's Tiago Apolonia at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

India's Kamal Achanta celebrates after winning the table tennis men's singles second round match against Portugal's Tiago Apolonia at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Portugal's Tiago Apolonia competes during the table tennis men's singles second round match against India's Kamal Achanta at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

India's Kamal Achanta competes during the table tennis men's singles second round match against Portugal's Tiago Apolonia at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

India's Kamal Achanta competes during the table tennis men's singles second round match against Portugal's Tiago Apolonia at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Slovenia's Tokic Bojan competes during the table tennis men's singles second round match against Croatia's Pucar Tomislav at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Denmark's Jonathan Groth celebrates after winning the table tennis men's singles second round match against Hungary's Bence Majoros at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Egypt's Omar Assar competes during the table tennis men's singles second round match against Ukraine's Kou Lei at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Egypt's Omar Assar reacts during the table tennis men's singles second round match against Ukraine's Kou Lei at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Croatia's Pucar Tomislav competes during the table tennis men's singles second round match against Slovenia's Tokic Bojan at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Egypt's Omar Assar competes during the table tennis men's singles second round match against Ukraine's Kou Lei at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Egypt's Omar Assar prays after winning the table tennis men's singles second round match against Ukraine's Kou Lei at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Egypt's Omar Assar and Ukraine's Kou Lei clap paddles after finished the table tennis men's singles second round match at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Egypt's Omar Assar prays after winning the table tennis men's singles second round match against Ukraine's Kou Lei at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Ukraine's Kou Lei competes during the table tennis men's singles second round match against Egypt's Omar Assar at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Hungary's Bence Majoros competes during the table tennis men's singles second round match against Denmark's Jonathan Groth at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Denmark's Jonathan Groth competes during the table tennis men's singles second round match against Hungary's Bence Majoros at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Denmark's Jonathan Groth serves during the table tennis men's singles second round match against Hungary's Bence Majoros at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Denmark's Jonathan Groth competes during the table tennis men's singles second round match against Hungary's Bence Majoros at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Egypt's Omar Assar reacts during the table tennis men's singles second round match against Ukraine's Kou Lei at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Denmark's Jonathan Groth celebrates after winning the table tennis men's singles second round match against Hungary's Bence Majoros at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Egypt's Omar Assar prays after winning the table tennis men's singles second round match against Ukraine's Kou Lei at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

South Korea's Jang Woo-jin celebrates after winning the table tennis men's singles third round match against Britain's Paul Drinkhall at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Germany's Timo Boll competes during the table tennis men's singles third round match against Kazakhstan 's Kirill Gerassimenko at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Taiwan's Chuang Chih-Yuan celebrates after winning the table tennis men's singles third round match against Hong Kong's Wong Chun-ting at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Hong Kong's Wong Chun-ting, left, sits with his coach after losing the table tennis men's singles third round match against Taiwan's Chuang Chih-Yuan at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Germany's Timo Boll competes during the table tennis men's singles third round match against Kazakhstan 's Kirill Gerassimenko at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Novak Djokovic, of Serbia, walks on the court during a second round tennis match against Jan-Lennard Struff, of Germany, at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

South Korea's Jang Woo-jin competes during the table tennis men's singles third round match against Britain's Paul Drinkhall at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Germany's Timo Boll competes during the table tennis men's singles third round match against Kazakhstan 's Kirill Gerassimenko at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

South Korea's Jang Woo-jin reacts during the table tennis men's singles third round match against Britain's Paul Drinkhall at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Taiwan's Chuang Chih-Yuan competes during the table tennis men's singles third round match against Hong Kong's Wong Chun-ting at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Britain's Liam Pitchford competes during the table tennis men's singles third round match against Slovenia's Jorgic Darko at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Britain's Paul Drinkhall reacts during the table tennis men's singles third round match against South Korea's Jang Woo-jin at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Hong Kong's Wong Chun-ting competes during the table tennis men's singles third round match against Taiwan's Chuang Chih-Yuan at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Novak Djokovic, of Serbia, serves to Jan-Lennard Struff, of Germany, during second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Japan's Tomokazu Harimoto receives medical treatment on his hand during the table tennis men's singles third round match against Hong Kong's Lam Siu-hang at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Taiwan's Chuang Chih-Yuan celebrates after winning the table tennis men's singles third round match against Hong Kong's Wong Chun-ting at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Slovenia's Jorgic Darko competes during the table tennis men's singles third round match against Britain's Liam Pitchford at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Novak Djokovic, of Serbia, prepares to serve to Jan-Lennard Struff, of Germany, during second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Novak Djokovic, of Serbia, returns to Jan-Lennard Struff, of Germany, during second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Novak Djokovic, of Serbia, returns to Jan-Lennard Struff, of Germany, during second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Novak Djokovic, of Serbia, returns to Jan-Lennard Struff, of Germany, during second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Novak Djokovic, of Serbia, returns to Jan-Lennard Struff, of Germany, during second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Japan's Tomokazu Harimoto reacts during the table tennis men's singles third round match against Hong Kong's Lam Siu-hang at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Japan's Tomokazu Harimoto celebrates after winning the table tennis men's singles third round match against Hong Kong's Lam Siu-hang at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Hong Kong's Lam Siu-hang reacts during the table tennis men's singles third round match against Japan's Tomokazu Harimoto at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Hong Kong's Lam Siu-hang reacts during the table tennis men's singles third round match against Japan's Tomokazu Harimoto at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Japan's Tomokazu Harimoto celebrates after winning the table tennis men's singles third round match against Hong Kong's Lam Siu-hang at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Japan's Tomokazu Harimoto drinks during the table tennis men's singles third round match against Hong Kong's Lam Siu-hang at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Japan's Tomokazu Harimoto competes during the table tennis men's singles third round match against Hong Kong's Lam Siu-hang at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Novak Djokovic, of Serbia, gestures after defeating Jan-Lennard Struff, of Germany, in the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Novak Djokovick, of Serbia, reacts after winning a point off Jan-Lennard Struff, of Germany, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Japan's Tomokazu Harimoto, left, and Hong Kong's Lam Siu-hang clap paddles after the table tennis men's singles third round match at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Novak Djokovick, of Serbia, plays Jan-Lennard Struff, of Germany, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Novak Djokovick, of Serbia, reacts after defeating Jan-Lennard Struff, of Germany, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Hong Kong's Lam Siu-hang reacts during the table tennis men's singles third round match against Japan's Tomokazu Harimoto at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Novak Djokovick, of Serbia, plays Jan-Lennard Struff, of Germany, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Japan's Tomokazu Harimoto celebrates after winning the table tennis men's singles third round match against Hong Kong's Lam Siu-hang at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Japan's Tomokazu Harimoto reacts during the table tennis men's singles third round match against Hong Kong's Lam Siu-hang at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Japan's Tomokazu Harimoto receives medical treatment during the table tennis men's singles third round match against Hong Kong's Lam Siu-hang at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo. (AP Photo/Kin Cheung)

Novak Djokovic, of Serbia, returns to Jan-Lennard Struff, of Germany, during second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Jan-Lennard Struff, of Germany, plays Novak Djokovick, of Serbia, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Novak Djokovick, of Serbia, plays Jan-Lennard Struff, of Germany, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Novak Djokovic, of Serbia, returns to Jan-Lennard Struff, of Germany, during second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Novak Djokovic, of Serbia, returns to Jan-Lennard Struff, of Germany, during second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Novak Djokovic, of Serbia, reacts during a second round tennis match against Jan-Lennard Struff, of Germany, at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Novak Djokovick, of Serbia, reacts after winning a point off Jan-Lennard Struff, of Germany, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Novak Djokovick, of Serbia, reacts after defeating Jan-Lennard Struff, of Germany, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Novak Djokovick, of Serbia, reacts after defeating Jan-Lennard Struff, of Germany, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Novak Djokovick, of Serbia, plays Jan-Lennard Struff, of Germany, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Novak Djokovick, of Serbia, plays Jan-Lennard Struff, of Germany, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)