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George DreherWould have to say that taking their entire career into consideration, the greatest was Marciano, followed by Louis & Ali. I hate the guy, but prime Mike Tyson (1985-88) when he had Rooney as his trainer was probably unbeatable by anyone in history. The night he knocked out Michael Spinks, no one in history could have gone the distance with him. When Kevin Rooney packed his bags, Tyson was finished.