The win gives Dressel his first individual Olympic gold medal. He previously had earned three relay gold medals, including the men’s 4×100 meter freestyle relay earlier in these Games.
Australia’s Kyle Chalmers earned the silver medal with a time of 47.08, while Russian Kliment Kolesnikov won bronze in 47.44.
“I don’t know if it’s set in yet,” he said after his win in Tokyo. “Right now, I’m just kinda hurting. But it’s been a really tough year. It’s really hard. So to have the results show up — it really came together. So I’m happy,” he said.
“Whenever you get in a high stress situation, you kind of freak out,” Biles told reporters on Tuesday. “I have to focus on my mental health and not jeopardize my health and well-being.
“It just sucks when you’re fighting with your own head.”