Singapore's Yu Mengyu competes during the table tennis women's singles quarterfinal match against Japan's Kasumi Ishikawa at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo. (AP Photo/Kin Cheung)

Japan's Kasumi Ishikawa reacts during the table tennis women's singles quarterfinal match against Singapore's Yu Mengyu at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo. (AP Photo/Kin Cheung)

Japan's Kasumi Ishikawa reacts during the table tennis women's singles quarterfinal match against Singapore's Yu Mengyu at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo. (AP Photo/Kin Cheung)

Singapore's Yu Mengyu celebrates after the table tennis women's singles quarterfinal match against Japan's Kasumi Ishikawa at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo. (AP Photo/Kin Cheung)

Singapore's Yu Mengyu celebrates after winning the table tennis women's singles quarterfinal match against Japan's Kasumi Ishikawa at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo. (AP Photo/Kin Cheung)

Singapore's Yu Mengyu looks at the ball during the table tennis women's singles quarterfinal match against Japan's Kasumi Ishikawa at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo. (AP Photo/Kin Cheung)

Japan's Kasumi Ishikawa reacts during the table tennis women's singles quarterfinal match against Singapore's Yu Mengyu at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo. (AP Photo/Kin Cheung)

Japan's Kasumi Ishikawa competes during the table tennis women's singles quarterfinal match against Singapore's Yu Mengyu at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo. (AP Photo/Kin Cheung)

Singapore's Yu Mengyu competes during the table tennis women's singles quarterfinal match against Japan's Kasumi Ishikawaat the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo. (AP Photo/Kin Cheung)

Singapore's Yu Mengyu looks at the ball during the table tennis women's singles quarterfinal match against Japan's Kasumi Ishikawa at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo. (AP Photo/Kin Cheung)

Singapore's Yu Mengyu serves during the table tennis women's singles quarterfinal match against Japan's Kasumi Ishikawa at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo. (AP Photo/Kin Cheung)

Singapore's Yu Mengyu competes during the table tennis women's singles quarterfinal match against Japan's Kasumi Ishikawa at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo. (AP Photo/Kin Cheung)