Watch Julio Cesar Castillo and MarissaAnn in The Voice Knockout Rounds on Oct. 30, 2012 (VIDEO)

After last night’s round of knockouts, it was time for Team Blake Shelton to prove themselves on The Voice stage. Up next Blake paired two underdogs — mariachi singer Julio Cesar Castillo and Blake’s "steal" MarissaAnn. Julio surprised his coach by tackling a Justin Bieber song. But MarissaAnn wasn’t ready to throw in the towel and chose "Lady Marmalade." MarissaAnn’s former coach, Christina Aguilera, said she delivered on such a...


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