LCM (50 Meters) 7:45 p.m. Finals (varying based on broadcast needs) Long course Gretchen Walsh has arrived. In the preliminary heats of the women’s 100 butterfly at the 2024 U.S. Olympic trials, Walsh clocked a time of 55.94 to take the top overall seed. She improved 0.2 seconds from her previous personal best of 56.14, which was set at the San Antonio Pro Swim Series this April. She also becomes the sixth-fastest performer of all-time, the second-fastest American of all-time, and the seventh woman in history to go under 56 seconds in the event.