Gretchen Walsh SMASHES 50m butterfly world record at Swimming World Cup in Carmel | NBC Sports

American Gretchen Walsh extended her torrid run of record-breaking swims, surpassing her own short-course record in the 50m butterfly at Saturday's World Aquatics Swimming World Cup meet in Carmel, Indiana. #NBCSports #Swimming #GretchenWalsh » Subscribe to NBC Sports: https://www.youtube.com/nbcsports?sub_confirmation=1 » Watch Live Sports on Peacock: https://peacocktv.smart.link/v82e9dl56 NBC Sports Group serves sp...