Simone Manuel, of United States, leaves the pool after a women's 50-meter freestyle semifinal at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/David Goldman)

Caeleb Dressel, of the United States, swims in the men's 100-meter butterfly final at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/Gregory Bull)

Caeleb Dressel, of the United States, starts the men's 100-meter butterfly final at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/Gregory Bull)

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, 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)

Katie Ledecky, of the United States, reacts after winning a heat of the women's 800-meter freestyle at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Charlie Riedel)

Katie Ledecky, of the United States, swims to the gold medal in the women's 800-meter freestyle final at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/Jeff Roberson)

Kaylee Mckeown, of Australia, celebrates after winning the gold medal in the women's 200-meter backstroke final at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/David Goldman)