Emma Mckeon, of Australia, finishes a women's 50-meter freestyle heat at the 2020 Summer Olympics, Friday, July 30, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Emma Mckeon, top, of Australia, swims to set an olympic record in a women's 50-meter freestyle semifinal followed by Katarzyna Wasick, center, of Poland, and Arina Surkova, bottom, of the Russian Olympic Committee, at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/Jeff Roberson)

Emma Mckeon, of Australia, celebrates after winning the gold medal in the women's 100-meter freestyle final at the 2020 Summer Olympics, Friday, July 30, 2021, in Tokyo, Japan. (AP Photo/David Goldman)

Emma Mckeon, of Australia, right, celebrates with teammate Cate Campbell after winning the women's 100-meter freestyle final at the 2020 Summer Olympics, Friday, July 30, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Emma Mckeon, of Australia, poses after winning the gold medal in the women's 100-meter freestyle final at the 2020 Summer Olympics, Friday, July 30, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Emma Mckeon, of Australia, celebrates after winning the gold medal in the women's 100-meter freestyle final at the 2020 Summer Olympics, Friday, July 30, 2021, in Tokyo, Japan. (AP Photo/David Goldman)

Simone Manuel, top, of the United States, swims alongside Emma Mckeon, of Australia, during heat 10 of the women's 50-meter freestyle at the 2020 Summer Olympics, Friday, July 30, 2021, in Tokyo, Japan. (AP Photo/Jeff Roberson)

Emma Mckeon, of Australia, finishes a women's 50-meter freestyle semifinal at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)