Team USA's Gretchen Walsh dominated the women's 100m butterfly final at World Aquatics Championships in Singapore, setting a championship record with the second-fastest time in history behind only her own world record in the event. #NBCSports #GretchenWalsh #Swimming » Subscribe to NBC Sports: youtube.com/nbcsports?sub_confirmation=1 » Watch Live Sports on Peacock: peacocktv.smart.link/v82e9dl56 NBC Sports Group serves sports fans 24/7 with premier live events, insightful studio shows, and compelling original programming. NBC Sports is an established leader in the sports media landscape with an unparalleled collection of sports properties that include the Olympics, NFL, Premier League, Big Ten, NASCAR, PGA TOUR, the Kentucky Derby, Tour de France and many more. Subscribe to our channel for the latest sporting news and highlights! Visit NBC Sports: nbcsports.com Find NBC Sports on Facebook: facebook.com/NBCSports Follow NBC Sports on Twitte...