In the final men's 400m semifinal at World Championships, Team USA's Quincy Hall won a stunner when medal favorite Steven Gardiner pulled up at the final turn and couldn't finish #NBCSports #QuincyHall #StevenGardiner » Subscribe to NBC Sports: youtube.com/nbcsports » 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, NASCAR, PGA TOUR, the Kentucky Derby, Tour de France, French Open, IndyCar and many more. Subscribe to our channel for the latest sporting news and highlights! Visit NBC Sports: nbcsports.com Find Premier League on NBC Sports: nbcsports.com/soccer/prem... Find NASCAR on NBC Sports: nbcsports.com/motors/nascar Find Sunday Ni...