In terms of sheer terror then it is Liston in the early 60's, Foreman in the early 70's ( remember people actually feared for Ali's life before the Rumble),i have never seen a fighter with such intensity as Duran when he fought Leonard the first time, he was dead set scary and that was part of his psyche. I think Leonard was at times overawed by Duran as much as anything. Sadly this was the last time we really saw the great Roberto Duran at his peak.
Hagler was a menacing figure and Tyson from 1986-1990 was probably the meanest, nastiest, most ferocious fighter ever seen.
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