I say apart from Lewis I can't see anyone from any era having a chance, the size and movement would be too much, maybe Tyson Fury would be an interesting fight but until we see the Wilder fight it's hard to say as Fury hasn't really fought anyone other than Wlad.
Muhammad Ali, Joe Louis, and Mike Tyson are a few I'd pick (that I don't think will be controversial).
*cracks knuckles* Wladimir Klitscko Lennox Lewis Larry Holmes Sonny Liston Muhammad Ali Joe Louis George Foreman Evander Holyfield Rocky Marciano Jack Dempsey Mike Tyson Joe Frazier And finally, Chris Byrd
Too many to name. Ducking a Byrd rematch really says a lot about his limitations as a fighter. He had no answer to Byrd crouch and then coming up and tagging him in the chest. When his stamina gave out he quit, which is why Larry Merchant criticized him so harshly.
If we're having more controversial picks, I'll add from what's been mentioned, Ezzard Charles, Jersey Joe Walcott, James J Jeffries, Jack Johnson, Max Schmeling, and with a good solar alignment, Jess Willard and Max Baer.
Best for best, I'd make Ali, Foreman and Lennox favourites. 50-50: Larry Holmes, Mike Tyson Everybody else is an underdog to a greater or lesser degree.
Beat me to it. Vitali was a formidable guy, and I believe he is better than his record, but a lot of guys COULD beat him, and I would sure favor Foreman, Ali, and a few others.
Ali pre exile stops him in 14 Ali after regaining belt out scores him . Liston stops him via cuts in 10 Holmes in prime beat's him up ,stops him in 11 Prime Foreman rocks and shocks him early and kos him in 5. Frazier of 71 puts so much pressure on him and has him a bloody mess by the 12 th
With certainty, no one. With a probability greater than 50%: Lewis Louis Ali Holmes Tyson Foreman Holyfield With a chance of 20% or more, dozens, at least. (These aren't real probabilities of course, but personal estimations.)