Watch Alessandra Guercio and Dez Duron in The Voice Knockout Rounds on Oct. 30, 2012 (VIDEO)

After last night’s round of knockouts, it was time for Team Christina Aguilera to prove themselves on The Voice stage. This performance featured two contestants who had a lot to prove — Alessandra Guercio and Dez Duron. Alessandra was one of Christina’s "steals" from the battle rounds and Dez was back after failing to make it past the blind auditions last season. Alessandra was ready to come back powerful and confident, singing Rihanna’s "Take a...


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