Prime for Prime Frazier could take most of those guys....

Frazier had the will and heart to stop Holmes late

Frazier had an up and down bobbing style which would be very effective vs Tyson's hooks but not his uppercuts, I still think Frazier had twice the heart Tyson did and would be able to beat Tyson!!! Frazier's workrate would have been good vs Tyson too.

Lewis would have DEMOLISHED Frazier....Lennox was patient but had HUGE power especially with the uppercut and that would spell big trouble for Frazier.

Joe Louis would beat Joe Frazier, there is no doubt in my mind that Joe Louis was the best all around fighter ever in the heavyweight division.

As for Dempsey and Marciano it would hard to tell seeing how neither man ever got KO'd and neither man lost decisions routinely...I think Frazier's size would be a factor but not as much as his workrate which I think would be more effective vs Dempsey who threw mostly haymakers....Rocky was constantly throwing punches from bell to bell!!!!

Frazier-Liston is the toughest for me to call I think mainly due to the way Foreman handled Frazier