I am going to agree with Lyle's statement of Tyson being the greatest combination puncher. With no pitty pat in anyone of his punches but I wouldn't rank Tyson the hardest puncher.

Another fighter who comes to mind is Gerry Cooney. George Foreman in his biography said "when he hit me with a left hook to the body it felt like I came out of my shoes".Another comment was from Joe Bugner who said "Frazier's left hook could really do damage but Cooney's left hook goes right through you".I'll give you one more when Jimmy Young was asked what was the hardest punch you've been hit with Jimmy replied "a left hook to the body by Gerry Cooney".