Regan Smith swam a stunning 57.46 in the 100 backstroke at the TYR Pro Swim Series in Fort Lauderdale, securing the seventh-fastest time ever.
What happened?
She took out the final in 28.02 and finished off the race in 29.44, more than a second quicker than the Olympic medalists on either side of her.
Regan Smith's time is the fastest in the world this year and surpasses Kaylee McKeown's 57.65.
Why it matters for Regan Smith
This performance solidifies Smith's position as a top contender in the 100 backstroke, having already won the 200 butterfly and 200 backstroke at the Pro Series.
Katharine Berkoff finished second in 58.79, with Canada's Kylie Masse third in 58.90.
What comes next?
The session also included the men's 800 free, 100 back, and 100 fly, as well as competition in the 200 breaststroke, 200 IM, and 50 freestyle.
Gretchen Walsh provided a third world record with her incredible time of 54.60 in the 100 butterfly.
Regan Smith owns the two quickest times ever in the 100 back, including the world record of 57.13 she posted at last summer's Olympic Trials.
She blasted back with an Olympic-record time of 57.28 leading off the U.S. women's 400 medley relay, which eventually secured gold.
The final evening of racing in Fort Lauderdale began with a bang as Katie Ledecky dropped a world record for the first time since 2018.
Bobby Finke tried to follow that up with a big performance in the men's 800 free, swimming a mark of 14:54.49 three days earlier in the 1500 free.
Finke was not challenged at any stage of the race, opening up a lead of one-and-a-half seconds by the 100-meter mark.
Hubert Kos added to his win in the 200 back with a dominant performance over 100 meters, crushing the field on both lengths.