Watch Aquile and Sylvia Yacoub 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. For Christina’s final pairing of the night, she chose smooth singer Aquile and fiery pop singer, Sylvia Yacoub. While Aquile was ready to throw a Bruno-Mars-style "Grenade" into the ring, Sylvia took on the popular Xtina hit, "Fighter." Blake said Aquile’s performance was solid, but also said Sylvia was great at kicking ass....


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