Caeleb Dressel became the first swimmer to win three gold medals on a single night at the world championships and fellow American Katie Ledecky cruised to a victory in the 800-meter freestyle for her fifth gold medal on Saturday in Budapest, Hungary.
Dressel won all of three of his races during the course of about two hours, starting with a victory in the 50-meter freestyle in 21.15 seconds, an American record.
The 20-year-old rising University of Florida senior came back about 30 minutes later in the 100 butterfly to win in 49.86, missing Michael Phelps' world record by .04.
Dressel closed the night by leading off a world-record performance in the mixed 4x100 free relay.
"Man, that was a lot of fun," said Dressel, who has six gold medals in the championships, putting him in position to tie Phelps' record of seven golds at the 2007 worlds in Melbourne, Australia.
"The comparisons are probably inevitable. But I'm not the same person as Michael. ... My goal here is not to count medals. So, it's a tough question. I don't know if I welcome them (comparisons), but I know they're going to come. I don't think it puts any more pressure on me."
Dressel will close the meet Sunday night on the 4x100 medley relay team.
The 20-year-old Ledecky won the 800-meter freestyle in 8 minutes, 12.68 seconds, which was nearly 8 seconds off her world record at last summer's Rio Olympics, where she won five gold medals.
Ledecky settled for silver in the 200 free earlier in the week and didn't come close to breaking any of her personal bests. She was gunning to match American Missy Franklin's record for female swimmers of six gold medals in the 2013 world championships.
"I've never walked away from a season completely satisfied, even last year," Ledecky said. "I can really take what I've learned and use it moving forward. It gets me really excited. If that was my bad year for the next four years, then the next couple years are going to be pretty exciting."