Sweden's Mattias Falck competes during the table tennis men's singles third round match against Egypt's Omar Assar at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

Sweden's Mattias Falck competes during the table tennis men's singles third round match against Egypt's Omar Assar at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

Germany's Timo Boll competes during the table tennis men's singles round of 16 match against South Korea's Jeoung Young-sik at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

South Korea's Jeoung Young-sik competes during the table tennis men's singles round of 16 match against Germany's Timo Boll at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

Taiwan's Lin Yun-ju competes during the table tennis men's singles round of 16 match against Brazil's Gustavo Tsuboi at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

South Korea's Jeoung Young-sik competes during the table tennis men's singles round of 16 match against Germany's Timo Boll at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

South Korea's Jeoung Young-sik competes during the table tennis men's singles round of 16 match against Germany's Timo Boll at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

Taiwan's Lin Yun-ju competes during the table tennis men's singles round of 16 match against Brazil's Gustavo Tsuboi at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

Taiwan's Lin Yun-ju competes during the table tennis men's singles round of 16 match against Brazil's Gustavo Tsuboi at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

South Korea's Jeoung Young-sik celebrates after winning the table tennis men's singles round of 16 match against Germany's Timo Boll at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

China's Chen Meng gestures during the table tennis men's singles round of 16 match against Canada's Zhang Mo at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

Germany's Timo Boll competes during the table tennis men's singles round of 16 match against South Korea's Jeoung Young-sik at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

Egypt's Omar Assar jumps after winning the table tennis wmen's singles third round match against Sweden's Mattias Falck at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

Germany's Timo Boll competes during the table tennis men's singles round of 16 match against South Korea's Jeoung Young-sik at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

China's Chen Meng competes during the table tennis men's singles round of 16 match against Canada's Zhang Mo at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

Taiwan's Lin Yun-ju gestures during the table tennis men's singles round of 16 match against Brazil's Gustavo Tsuboi at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

South Korea's Jang Woo-jin competes during the table tennis men's singles round of 16 match against Hugo Calderano, of Brazil at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

Egypt's Omar Assar celebrates after winning the table tennis men's singles round of 16 match against Taiwan's Chuang Chih-Yuan at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

Taiwan's Chuang Chih-Yuan competes during the table tennis men's singles round of 16 match against Egypt's Omar Assar at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

Taiwan's Chuang Chih-Yuan reacts during the table tennis men's singles round of 16 match against Egypt's Omar Assar at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

Germany's Dimitrij Ovtcharov reacts after winning the table tennis men's singles round of 16 match against Japan's Koki Niwa at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

China's Ma Long reacts during the table tennis men's singles round of 16 match against France's Simon Gauzy at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

South Korea's celebrates after winning the table tennis men's singles round of 16 match against Hugo Calderano, of Brazil at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

China's Ma Long reacts during the table tennis men's singles round of 16 match against France's Simon Gauzy at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

South Korea's Jang Woo-jin competes during the table tennis men's singles round of 16 match against Hugo Calderano, of Brazil at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

South Korea's Jang Woo-jin competes during the table tennis men's singles round of 16 match against Hugo Calderano, of Brazil at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

South Korea's Jang Woo-jin reacts during the table tennis men's singles round of 16 match against Hugo Calderano, of Brazil at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Kin Cheung)

Daniil Medvedev, of the Russian Olympic Committee, serves to Fabio Fognini, of Italy, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Fabio Fognini, of Italy, serves to Daniil Medvedev, of the Russian Olympic Committee, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Fabio Fognini, of Italy, returns to Daniil Medvedev, of the Russian Olympic Committee, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Daniil Medvedev, of the Russian Olympic Committee, serves to Fabio Fognini, of Italy, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Daniil Medvedev, of the Russian Olympic Committee, returns to Fabio Fognini, of Italy, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Fabio Fognini, of Italy, returns to Daniil Medvedev, of the Russian Olympic Committee, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Fabio Fognini, of Italy, serves to Daniil Medvedev, of the Russian Olympic Committee, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Daniil Medvedev, of the Russian Olympic Committee, returns to Fabio Fognini, of Italy, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Daniil Medvedev, of the Russian Olympic Committee, pauses during a third round men's tennis match against Fabio Fognini, of Italy, at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Fabio Fognini, of Italy, returns to Daniil Medvedev, of the Russian Olympic Committee, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Fabio Fognini, of Italy, returns to Daniil Medvedev, of the Russian Olympic Committee, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Fabio Fognini, of Italy, reacts after losing a point to Daniil Medvedev, of the Russian Olympic Committee, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Daniil Medvedev, of the Russian Olympic Committee, returns to Fabio Fognini, of Italy, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Daniil Medvedev, of the Russian Olympic Committee, returns to Fabio Fognini, of Italy, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Fabio Fognini, of Italy, throws his racket during a third round men's tennis match against Daniil Medvedev, of the Russian Olympic Committee, at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Daniil Medvedev, of the Russian Olympic Committee, returns to Fabio Fognini, of Italy, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Fabio Fognini, of Italy, returns to Daniil Medvedev, of the Russian Olympic Committee, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Fabio Fognini, of Italy, reacts during a third round men's tennis match against Daniil Medvedev, of the Russian Olympic Committee, at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Daniil Medvedev, of the Russian Olympic Committee, is tended to during a third round men's tennis match against Fabio Fognini, of Italy, at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Daniil Medvedev, of the Russian Olympic Committee, pauses during a third round men's tennis match against Fabio Fognini, of Italy, at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Daniil Medvedev, of the Russian Olympic Committee, is tended to during a third round men's tennis match against Fabio Fognini, of Italy, at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)