LCM (50 Meters) 7:45 p.m. Finals (varying based on broadcast needs) Day 1 Prelims Live Recap Day 1 Finals Live Recap. Swim fans in were treated to a world record on the opening night of the U.S. Olympic Trials, as Gretchen Walsh shattered the 100 butterfly standard set by Sarah Sjostrom in 2016. But those in attendance also got the chance to be a part of another record: the largest crowd at a swim meet.