Caeleb Dressel, of the 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/Jae C. Hong)

Members of the U.S. men's 4x100-meter medley relay team, Caeleb Dressel, Zach Apple, Ryan Murphy and Michael Andrew, carry a sign that reads, "Thank you, Tokyo," after winning the gold medal at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Emma Mckeon, of Australia, holds the gold medal for the women's 4x100-meter medley relay 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, from left, Ryan Murphy, Zach Apple, Michael Andrew and Caeleb Dressel, celebrate winning the gold medal at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Gregory Bull)

Caeleb Dressel, of the 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/Jae C. Hong)

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

Robert Finke, of United States, celebrates after winning the gold medal in the men's 1500-meter freestyle final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Members of the U.S. 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/Jae C. Hong)

Emma Mckeon, of Australia, puts on her gold medal during a victory ceremony for the women'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 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)

Emma Mckeon, of Australia, poses after winning the gold medal in the women'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 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)

Robert Finke, of United States, celebrates after winning the gold medal in the men's 1500-meter freestyle final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Robert Finke, of United States, poses after winning the gold medal in the men's 1500-meter freestyle final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Gregory Bull)

Emma Mckeon, of Australia, dives off the starting block in the women'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)

Robert Finke, of the United States, swims to a second place finish in heat 4 of the men's 1500-meter freestyle at the 2020 Summer Olympics, Friday, July 30, 2021, in Tokyo, Japan. (AP Photo/Jeff Roberson)

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)

Emma Mckeon, of Australia, smiles after winning the gold medal in a women's 50-meter freestyle final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/David Goldman)

Robert Finke, of United States, swims in the men's 1500-meter freestyle final at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)