Mike Tyson couldn't hang with a lot of the legends, no disrespect to Mike of course.

Ali: Ali by late TKO, Tyson didn't have the heart to hang with him
Louis: Joe totally whips Tyson's ass...no damn contest
Marciano: Rocky beats Tyson up...Rocky never quit, never took a round off. He'd wear Miek down.
Foreman: Mike may wet himself before and after this one
Holmes: well Tyson COULD take a prime Holmes as Larry did allow himself to get caught
Frazier: Interesting match up...I think Tyson might have taken that one
Dempsey: Tough to call, I'll say Tyson early
Norton: Tyson KO 1
Shavers: Tyson KO 1

Tyson was great but I think he'd have trouble hanging with the big dogs