I would say Tyson has to be in the argument. I would agree in his heyday the best pure puncher ever. George Foreman is bigger but doesn't have the hand speed in his prime. His punches were heavy, but he didn't have the snap. Tyson had hand speed close to Floyd Patterson, and with Tyson's weight advantage he has the power edge. Frazier, Gerry Conney (hook alone), are the only other ones I can say have power. Current crop - forget about it. Just to qualify, I am rating 70's and later, I can't say Marciano, Johnson, Johannson because I just don't know. Great subject.
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