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"The Golden Boy" was one of the most feared fighters and is the most lucrative fighter to date. He knocked out 17 world champions and won 10 world titles, from super featherweight (his first belt, against Jimmy Bredahl, top) to middleweight (his last title, against Felix Strum, bottom). The Olympic gold medalist closed his career with a 39-6 record, with 30 wins by way of knockout.

Photo: Jed Jacobsohn/Getty Images; Holy Stein/Getty Images

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