American quartet hangs on in 4x100 relay heat to advance to men's final at worlds | NBC Sports

In an event where the American men have traditionally had problems getting the baton around the track, the team of Christian Coleman, Ronnie Baker, Trayvon Bromell, and T'Mars McCallum were able to secure an automatic berth in Sunday's 4x100m relay final with a second place heat finish #NBCSports #TeamUSA #trackandfield » Subscribe to NBC Sports: https://www.youtube.com/nbcsports?sub_confirmation=1 » Watch Live Sport...