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Mayweather, like Marciano, a rarity

Posted: February 26, 2013 at 3:35 a.m.

Rarely does the boxing industry turn up an undefeated pro fighter — especially a heavyweight champion — but Rocky Marciano managed it: 49 fights, 49 victories, 43 knockouts.

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Sports, Pages 18 on 02/26/2013

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