Ex-UFC fighter Melvin Guillard knocked out a man on the street in Colorado while working as a bouncer for a popular bar ... and TMZ Sports has now obtained video of the violent punch. SUBSCRIBE — About TMZ Sports: Some of the best stories in sports have been off the field and we’re reporting on athletes from NFL, NBA, UFC, WWE, MLB and more! Subscribe to TMZ Sports on YouTube for the latest news, exclusive interviews, clips from TMZ Sports on FS1 and videos of your favo
Hide player controls
Hide resume playing