Caeleb Dressel of the United States starts in his heat of the men's 100-meter freestyle at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Swimmers compete in a heat of the men's 800-meter freestyle at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo, Japan. (AP Photo/Charlie Riedel)

Caeleb Dressel of the United States stands on the start blocks for his heat of the men's 100-meter freestyle at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Mykhailo Romanchuk, of Ukraine, celebrates after winning a heat of the men's 800-meter freestyle at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo, Japan. (AP Photo/Petr David Josek)

Robert Finke, of the United States, swims in a heat of the men's 800-meter freestyle at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo, Japan. (AP Photo/Martin Meissner)