1. Tua vs the likes of Marciano and Frazier. I love Rocky and Joe but the more powerful Tua stylistically matches well vs them even though Tua is inferior to them in terms of actual skill. Not saying they don't stand a chance but no doubt that Tua would cause all sorts of issues for them. 2. Corrie Sanders vs Lennox Lewis - Lewis would be favoured here BUT a fast handed southpaw with a big left hand can never be counted out. Especially considering both Briggs and Holyfield managed to stun Lewis with left hands and neither one of them were southpaws. Sure Lewis is the far more proven fighter but styles make fights - and Sanders arguably has faster hands than any prime fighter Lewis ever fought. Combine this with Lewis's massive size which made him a relatively easy target and Sanders being 6'4 with long arms, i am certain he would stand a pretty good chance. 3. Ibeabuchi vs Holyfield - Ike is unproven, yes, but he did have a number of things that would bother the real deal. Excellent work rate, very good power, good punching variations and a strong chin. Holyfield often had a tendency to brawl and i think that while you have to favour the ATG here, stylistically Ike could cause a lot of issues since Holyfield does not have the kind of power to keep Ike off and he doesn't quite have the Ali like foot speed to keep the distance.
Tim Witherspoon for both Lewis and Holyfield. Against Lewis. At 6'3.5" Witherspoon was big enough not to be in big physical disadvantage against 6'5" Lewis. Witherspoon also had very good jab and enormous right hand - two things Lewis didn't like most in the ring. Plus Tim wasn't slow, had good skills and sturdy chin. I think his jab would give Lewis a lot of troubles from the very beginning and if Witherspoon lands that right hand at some point of the fight - it would be over. Against Holyfield Witherspoon would be a bigger and stronger man and he had good enough skills, work rate and ring IQ not to let Holyfield compensate his physical disadvantages with those parts of the game. I'm not saying Witherspoon would definitely beat Holyfield, I'd actually favour Holy slightly over him, but the fight would be very hard and physically exhausting for Holyfield and he would took a lot of damage in it.
There's a bunch I could name but to keep it fun, I'll only list one: Cleveland Williams vs. Wlad Klitschko
James Broad v Gene Tunney Tony Tubbs v Jack Dempsey David Bey v Jack Sharkey Pinklon Thomas v Joe Louis Mike Dokes v Rocky Marciano
Actually hate all your picks…don’t think any of the betters lose. But to each their own Marciano v James Toney I think James is the right kind of crazy with the right type of chin and style n pacing to be able to give Marciano fits. Ezzard Charles v Tyson think Charles at his peak could win this one if he survives past 6. He had an excellent chin the right style to win Max Baer v Wlad…this is the most interesting one. Def favor Wlad but I could c Max getting the upset