Katie Ledecky tore the old American record to pieces in the 1650, going an insane 15:15.17 to open up the night.
Teammates Liz Pelton and Missy Franklin will go head-to-head tonight in the 200 back final.
Missy Franklin won twice for California, including an intense showdown with fellow Olympian Katie Ledecky in the 200 free.
Cindy Tran and the Cal medley relays were off to a very good start on Friday morning, taking the top two spots in the 200 medley relay.
Among the night 1 swims will be Katie Ledecky chasing an American Record in the 500 free.
The wildly-decorated Natalie Coughlin swam the second-best time of her career in the 50 free on Thursday morning.