Technically none (it is a horrible term!) As for Greats, I say to keep it special a Great comes along roughly twice a decade. Queensberry Rules has been going for 150 years or so, thus there are around 30 Great fighters.
the only way wlad wins by ko is by desperately koing himself running into his changing room door before the fight. Martin Freeman style in Fargo. win win situation that is.
Yeah I won't profess that Mike Tyson would have beaten EVERY man to have ever lived regardless of who was in his corner, what he was doing outside the ring, weather or not the planets were in alignment, etc, etc, etc.. But I definitely agree that any man who stepped in the ring with him would have considered him a legitimate threat and that includes whoever the usual fantasy fight suspects are, ie, Joe Louis, Muhammad, Ali, Larry Holmes, George Foreman, Vitali and Wladimir, etc, etc.... He had an ora about him that was intimidating as hell and pressed for the victory starting during the stare down. A truly great fighter with fast hands, explosive power, solid chin and exceptional skills.. This crap about him being beaten by " anybody who stood up to him" is getting to be an old trend...