Caeleb Dressel of the United States swims in the men's 100-meter freestyle final at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Caeleb Dressel of the United States poses with his gold medal for the men's 100-meter freestyle at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Caeleb Dressel of the United States starts in the men's 100-meter freestyle final at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Robert Finke of the United States celebrates winning the men's 800-meters freestyle final at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Katie Ledecky of the United States swms the last leg of the women's 4x200-meter freestyle relay team at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Morry Gash)

Nic Fink of the United States rests after his swim in the men's 200-meter breaststroke final at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Izaac Stubbblety-Cook of Australia poses with his gold medal after winning the men's 200-meter breaststroke final at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Izaac Stubbblety-Cook, of Australia, reacts after winning the men's 200-meter breaststroke finalat the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Morry Gash)

Zhang Yufei of China swims in the women's 200-meter butterfly final at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Caeleb Dressel of the United States celebrates winning the men's 100-meter freestyle final at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Zhang Yufei of China poses with her gold medal after winning the women's 200-meter butterfly final at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Katie Ledecky of the United States swms the last leg of the women's 4x200-meter freestyle relay team at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Morry Gash)

Caeleb Dressel of the United States celebrates winning the men's 100-meter freestyle final at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Robert Finke of the United States poses with his gold medal for the men's 800-meters freestyle final at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Caeleb Dressel of the United States celebrates winning the men's 100-meter freestyle final at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Caeleb Dressel of the United States closes his eyes on the podium after receiving his gold medal for the men's 100-meter freestyle at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Caeleb Dressel of the United States waves on the podium after winning the men's 100-meter freestyle final at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Caeleb Dressel, of the United States, poses with the gold medal after winning the men's 100-meter freestyle final at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Charlie Riedel)

China's women's 4x200-meter freestyle relay team, of Yang Junxuan, Tang Muhan, Zhang Yifan and Li Bingjie carry their national flag after receiving their gold medals at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Izaac Stubbblety-Cook, right, of Australia, celebrates after winning the men's 200-meter breaststroke final with Arno Kamminga, of the Netherlandsat the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Martin Meissner)

Ariarne Titmus of Australia swims in a women's 200-meter freestyle final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)