The 20-year-old fired off a time of 51.94 in the 100 free, breaking Simone Manuel’s American Record of 52.04 and joining the exclusive sub-52 club.
Already the only woman sub-55, the performance makes Walsh the fastest in history by more than a second, with Sarah Sjostrom ranking #2 all-time at 55.48.
Mathias unleashed a monstrous best time of 58.19 in the 100 breast, putting him just five one-hundredths back of Michael Andrew’s American Record of 58.14.
The swim moves Curry up into a tie for seventh all-time among Americans, tying the legendary Michael Phelps.
Williamson dropped more than two seconds off his personal best time over the course of the day, moving to #6 all-time in the 200 IM in 1:38.48.
The Sun Devils were well under the current American Record, but were ineligible to break it with Ilya Kharun still in the process of changing citizenship.
Moesch’s time of 1:39.23 ranks her #2 all-time behind Missy Franklin, who established the current NCAA, American and U.S. Open Record of 1:39.10 in 2015.
Guiliano closed things out the meet by winning the men’s 50 free in a time of 21.43, lowering his personal best time and breaking Caeleb Dressel’s PSS Record.