Well Tucker went 12 rounds with Lewis, and beat Oliver McCall who beat Lewis.
James "Bonecrusher" Smith and Tucker were strictly in safe ,survival mode against Tyson. Anyone will tell you it's almost impossible to KO a guy when he's in a defensive shell.
As for ALI?? ppplleeeeaaassseeeeeee.. If "Plodding & bobbing" Joe Frazier could go 45 rounds with Ali and have a win in 3 close fights
Imagine Mike catching Ali with his left hook....KO! not even close!
It would be a horrible missmatch!
Almost as bad as a beating received by,.. say Vitali Klitschko
if he foolishly tried to fight Nicolai Valuev