Valero and Hamed are the 2 fighters that came to mind when I saw this question.
Smallest boxers with one punch KO power
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Come on now Prince naseem hands down he fought the best in his division at the time and had some crazy ass power, he would spar with heavyweights and they said he can punch. He was a featerweight with the power of a middleweight, shame he lost intrest in the sport he should have moved up to super featherweight and fought the champions their but he drained himself staying at featherwight at the back end of his career for over 6-7 years he stayed at featherwight.Comment
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