Earnie Shavers
Earnie Dee Shaver , best known as Earnie Shavers, is an American former professional boxer and twotime world heavyweight title challenger. He is considered by most boxing experts to be the hardestpunching knockout artist of all time, and he scoredfirstround knockouts included in this list are world heavyweight champions Jimmy Ellis and Ken Norton. Shavers is best known for his fights with Larry Holmes and Muhammad Ali despite losing these contests, he did score a heavy knockdown against Holmes, and had Ali badly hurt in the second round as well as during the final rounds of their fight.
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Source: Wikipedia