Dempsey. Better at practically everything.
Rocky Marciano would rape his granny and send them riding on his wazzlestick. Marciano would win.
Chimpanze
other people might not agree but i would have to go with ali, i just think that ali would be to quick for Tyson and that in the dying rounds Tyson would be getting tired and ali would wallop him ali would own Tyson if he can do it once he can do anyday Tyson would never win in a fight with ali
Rocky Marciano he had an undefeated career with 49 wins, 43 knockouts, and no losses.
The first person to beat Mike Tyson when he was the heavyweight champion was Buster Douglas. Here's the full list of Tyson's fights, with wins, loses and draws: http://en.wikipedia.org/wiki/Mike_Tyson#Professional_boxing_record
50 wins, 6 losses.
Tyson's professional record was 50 wins, 6 losses, 0 draws, 2 no contests. 44 of the 50 wins came by knockout.
Rocky Marciano, who retired undefeated with a record of 49 wins against zero losses.
Mike Tyson
Rocky Marciano, 49-0 No! It was not Rocky Marciano, hell no !! Julio Cesar Chavez went 90 fights without losing, 70 of them by the way of KO, and only one draw. http://en.wikipedia.org/wiki/Julio_Cesar_Chavez
i think Tyson will win