Kristof Milak of Hungary swims in a men's 200-meter butterfly final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Martin Meissner)

Ariarne Titmus of Australia holds up her gold medal after winning the women's 200-meter freestyle final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

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

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

Katie Ledecky, of the United States, celebrates after winning the women's 1500-meters freestyle final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Petr David Josek)

Caeleb Dressel of the United States rests after his men's 100-meter freestyle semifinal at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Martin Meissner)

Katie Ledecky, of the United States, poses with the gold medal after winning the women's 1500-meters freestyle final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Petr David Josek)

Ariarne Titmus, of Australia, touches the wall to win the women's 200-meter freestyle final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. At right is Siobhan Bernadette Haughey, of Hong Kong. (AP Photo/Morry Gash)

Kristof Milak of Hungary swims in a men's 200-meter butterfly final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Yui Ohashi, of Japan, reacts after winning the women's 200-meter individual medley final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Britain's men's 4x200-meters relay team of Tom Dean, James Guy, and Matthew Richards celebrate after winning the gold medal at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Martin Meissner)

Katie Ledecky, of the United States, reacts after winning the women's 1500-meters freestyle final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan.(AP Photo/Petr David Josek)

Yui Ohashi, of Japan, celebrates after winning the women's 200-meter individual medley final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Charlie Riedel)

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/Charlie Riedel)

Katie Ledecky, of United States, facts after a women's 200-meter freestyle final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Petr David Josek)

Katie Ledecky, right, of the United States, embraces compatriot Erica Sullivan after winning the women's 1500-meters freestyle final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Ariarne Titmus of Australia reacts after receiving her gold medal for the women's 200-meter freestyle final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Martin Meissner)

Ariarne Titmus, of Australia, left, is embraced by her coach, Dean Boxall, after winning the women's 200-meter freestyle final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Erica Sullivan of the United States poses with silver medal for the women's 1500-meters freestyle final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Yui Ohashi of Japan poses with her gold medal for the women's 200-meter individual medley final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)

Katie Ledecky, of the United States, poses with the gold medal after winning the women's 1500-meters freestyle final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Charlie Riedel)

United States' Caeleb Dressel, left, swims in a 100-meter freestyle semifinal at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo. (AP Photo/David J. Phillip)

Katie Ledecky, of the United States, reacts after winning the women's 1500-meters freestyle final at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)