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

Yan Zibei, of China, swims in the mixed 4x100-meter medley relay final at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/David Goldman)

Florent Manaudou, of France, swims in a men's 50-meter freestyle semifinal at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/Gregory Bull)

Britain's mixed 4x100-meter medley relay team, Kathleen Dawson, Adam Peaty, James Guy and Anna Hopkin, poses after winning the gold medal at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan.(AP Photo/Jae C. Hong)

Kaylee Mckeown, of Australia, embraces teammate Emily Seebohm after winnning 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)

Adam Peaty celebrates winning the gold medal in the mixed 4x100-meter medley relay final at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

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

Kathleen Ledecky, of United States, poses after winning 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/Jae C. Hong)

Kathleen Ledecky, of United States, celebrates after winning 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/Gregory Bull)

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)

James Guy, of Britain, and teammate Adam Peaty celebrate winning the gold medal in the mixed 4x100-meter medley relay final at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Kaylee Mckeown, of Australia, celebrates after wining the women's 200-meter backstroke final at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Caeleb Dressel, of United States, celebrates wining the gold medal in the men's 100-meter butterfly final at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Kathleen Ledecky, of United States, celebrates after winning 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/Jae C. Hong)

Caeleb Dressel, of the United States, left, talks with Britain's James Guy after the mixed 4x100-meter medley relay at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/David Goldman)

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/Gregory Bull)

Caeleb Dressel, of United States, celebrates after winning the gold medal in the men's 100-meter butterfly final at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/David Goldman)

Kathleen Ledecky, of the United States, left high-fives teammate Katie Grimes after Ledecky won the women's 800-meter freestyle final 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 United States, starts the men's 100-meter butterfly final at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Kathleen Ledecky, of United States, shows her gold medal after winning the women's 800-meter freestyle final at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/David Goldman)

CORRECTS TO RYAN MURPHY NOT JAMES GUY - Caeleb Dressel, of the United States, left, talks with teammate Ryan Murphy after they finished fifth in the mixed 4x100-meter medley relay at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/David Goldman)

Kaylee McKeown, of Australia, swims in a semifinal heat of the women's 200-meter backstroke at the 2020 Summer Olympics, Friday, July 30, 2021, in Tokyo, Japan. (AP Photo/Gregory Bull)

Caeleb Dressel, of United States, finishes a men's 50-meter freestyle semifinal at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/Jae C. Hong)

Kathleen Ledecky, of United States, celebrates after winning 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/Jae C. Hong)