If it's just about one punch, then Martinez vs Williams because it was legitimately a one punch knockout, Williams just never saw it coming. Hearns, much like Pacquiao against Hatton, had already done damage to Duran and it was just a matter of time before he got knocked out. Hearns vs Duran is the most impressive KO however, as it was the only time Duran was legitimately knocked out in more than a hundred fights.
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