BoxRec

Joe Louis
Rocky Marciano
Floyd Patterson
Sonny Liston
Muhammad Ali
Joe Frazier
George Foreman
Larry Holmes
Mike Tyson
Evander Holyfiield
Lennox Lewis

He KO's Floyd Patterson, and I'd say he has a decent shot at beating Rocky Marciano (though I'd favor Rocky). I don't see him beating the rest of them.

I'd favor him against all of them except Louis, Liston, Ali and possibly Foreman.

I skimmed over Liston's name when I first read the list. I'd favor him to beat Liston as well.

Dempsey knocks out Patterson.

I think he is 50/50 against Marciano, maybe slightly better. What a terrific fight that would be.

His next best chance (but less than 50/50) would probably be against Frazier, mainly due to Frazier being such a slow starter. I think Joe ultimately punches him out.

I'd favor all of the others over him.

Too far removed in eras to say with any certainty at all.