Undefeated Sergiy Dzinziruk. His name may be hard to pronounce, but it's much harder to deny him victory in the ring. The threat is real when he challenges 2010 Fighter of the Year Sergio Martinez. Don't miss their live fight Sat., March 12 at 10:30pm ET/ 7:30 pm PT on HBO. For more information, go to http://itsh.bo/lvp8Cq.

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