Caeleb Dressel, of United States, poses after winning the gold medal in the men's 50-meter freestyle final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Gregory Bull)

Caeleb Dressel, of United States, starts the men's 50-meter freestyle final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/David Goldman)

Caeleb Dressel, of the United States, celebrates winning the gold medal the men's 50-meter freestyle final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan.(AP Photo/Gregory Bull)

Caeleb Dressel, of the United States, right, swims to win the gold medal in the men's 50-meter freestyle final followed by Florent Manaudou, of France, for silver at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Jeff Roberson)

Caeleb Dressel, of United States, celebrates winning the gold medal the men's 50-meter freestyle final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Caeleb Dressel, of United States, celebrates after winning the gold medal in the men's 4x100-meter medley relay final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/David Goldman)

Caeleb Dressel, of United States, swims in the men's 4x100-meter medley relay final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/David Goldman)

Caeleb Dressel, of United States, poses after winning the gold medal in the men's 50-meter freestyle final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/David Goldman)

The United States' men's 4x100-meter medley relay team, Caeleb Dressel, Zach Apple, Ryan Murphy and Michael Andrew, celebrates winning the gold medal at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

The United States' men's 4x100-meter medley relay team, Caeleb Dressel, Zach Apple, Ryan Murphy and Michael Andrew, celebrate after winning the gold medal at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/David Goldman)

Caeleb Dressel, of the United States, celebrates his gold medal in the men's 4x100-meter medley relay final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Caeleb Dressel, of United States, celebrates after winning the gold medal in the men's 50-meter freestyle final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Gregory Bull)

Caeleb Dressel, of United States, celebrates winning the gold medal the men's 50-meter freestyle final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Caeleb Dressel, of United States, right, and teammates celebrate winning the gold medal in the men's 4x100-meter medley relay final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

The United States' Caeleb Dressel, left, is embraced by teammate Michael Andrew after their team won the men's 4x100-meter medley relay at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/David Goldman)