Sathiyan Gnanasekaran of India competes during the table tennis men's singles second round match against Lam Siu Hang of Hong Kong at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo. (AP Photo/Kin Cheung)

Kei Nishikori, bottom, of Japan, returns to Andrey Rublev, of the Russian Olympic Committee, during the tennis competition at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Andrey Rublev, of the Russian Olympic Committee, returns to Kei Nishikori, of Japan, during the tennis competition at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Andrey Rublev, of the Russian Olympic Committee, returns to Kei Nishikori, of Japan, during the tennis competition at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Kei Nishikori, of Japan, returns to Andrey Rublev, of the Russian Olympic Committee, during the tennis competition at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Kei Nishikori, of Japan, returns to Andrey Rublev, of the Russian Olympic Committee, during the tennis competition at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Kei Nishikori, of Japan, wipes his face during a tennis match against Andrey Rublev, of the Russian Olympic Committee, at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Andrey Rublev, of the Russian Olympic Committee, returns to Kei Nishikori, of Japan, during the tennis competition at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Kei Nishikori, of Japan, serves to Andrey Rublev, of the Russian Olympic Committee, during the tennis competition at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Kei Nishikori, of Japan, wipes his face during a tennis match against Andrey Rublev, of the Russian Olympic Committee, at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Kei Nishikori, of Japan, serves to Andrey Rublev, of the Russian Olympic Committee, during the tennis competition at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Kei Nishikori, of Japan, wipes his face during a tennis match against Andrey Rublev, of the Russian Olympic Committee, at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Andrey Rublev, of the Russian Olympic Committee, returns to Kei Nishikori, of Japan, during the tennis competition at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Kei Nishikori, of Japan, returns to Andrey Rublev, of the Russian Olympic Committee, during the tennis competition at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Kei Nishikori, of Japan, returns to Andrey Rublev, of the Russian Olympic Committee, during the tennis competition at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Kei Nishikori, of Japan, serves to Andrey Rublev, of the Russian Olympic Committee, during the tennis competition at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Kei Nishikori, of Japan, reacts after defeating Andrey Rublev, of the Russian Olympic Committee, during the tennis competition at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Kei Nishikori, of Japan, competes against Andrey Rublev, of the Russian Olympic Committee, during the tennis competition at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)