Last night began the intense competition also known as "The Battle Rounds" on NBC's "The Voice". Christina partnered up with singer/songwriter Sia to help her assign her team members in pairs. The pairs battled each other by singing the song that was assigned to them by Christina. The competition got even more intense when Christina and Sia needed to choose winners from their team, which brought them one step closer to becoming "The Voice".

For the full episode, watch below.