Regan Smith destroyed her 200 back/200 fly double on Saturday, winning both events by more than two seconds and setting a pair of U.S. Open meet records.
McIntosh, 17, reached the wall in 3:59.42, sneaking under Ledecky's U.S. Open meet record of 3:59.71 from last year, when Ledecky won by just .08 seconds.
Kate Douglass, who left Worlds with 6 medals will look to keep her reign as the best swimmer in the 200 IM, while also looking to throw down in the 50 free.