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Cain Velasquez celebrates after beating Junior dos Santos at UFC 155. (Courtesy: Tracy Lee for Y! Sports)

UFC 155: Junior dos Santos vs. Cain Velasquez

Highlights from UFC 155, featuring the heavyweight title fight between current champ

Junior dos Santos and former champ Cain Velasquez, on Saturday, Dec. 29, 2012 at the MGM Grand Garden Arena in Las Vegas.