French superstar Leon Marchand dominates men's 400m IM final at Pro Swim Series Austin | NBC Sports

French swimmer Leon Marchand dominated the men's 400m IM field to secure another victory at the U.S Pro Swim Series in Austin, Texas. #NBCSports #Swimming #ProSwimSeries » 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 sports fans 24/7 with premier live events, insightful studio shows, and com...