A menacing, 58-year-old Tyson looked ready to knock someone out in the final news brief before the big event, promising: ‘I’m not going to lose.’

Paul bout as a serious boxing match or a sideshow, a lot of people will have their eyes on this spectacle including as many as 60,000 in person at AT&T Stadium.  It's billed to be the most-watched combat sports event of all time.

Mike Tyson is a former undisputed world heavyweight champion and was once considered the toughest man on the planet. On Friday, he'll fight professionally for the first time since 2005 when he takes on YouTube star Jake Paul.