The Voice coaches sent four more artists through to the live shows from the "Knockout Round" during Tuesday night's broadcast of the NBC show's ninth season.

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The "Knockout Round" continued Tuesday night as Adam Levine, Gwen Stefani, Blake Shelton and Pharrell Williams kept pairing off members of their teams to duke it out over one spot in each matchup. The contestants were each allowed to sing a solo -- a song of their own choosing -- in the hope of outperforming their opponent.

During the "Knockout Round," each coach is allowed only one steal for his or her own team. An artist can only be stolen by another coach after losing his or her respective faceoff. All the contestants were guided and assisted by The Voice's newest key advisor Rihanna.

Gwen matched up Korin Bukowski with Summer Schappell. Korin sang "All I Want," while Summer performed "Little White Church." Adam said Summer had a lot of "spunk" and was "so animated," and Blake explained Korin was just as expressive vocally standing in one spot as Summer was working the stage.

Pharrell told Summer she's "a firecracker" but Korin always finds "a spooky way of conveying her message." Gwen was shocked by Summer's performance and attitude onstage, while she also pointed out Korin had found a new confidence and there was something special about her that she connected to.

Gwen dubbed Korin the winner because she can do the most good with her.

Adam paired Dustin Christensen, who sang "Free," with Keith Semple, who performed "I Want To Know What Love Is." Pharrell explained Dustin is "a poised natural talent" and a great communicator, but Keith is definitely a fighter. Gwen said Keith has a great personality and style, and Adam pointed out they've both grown in different ways. Adam declared Keith as the winner.

For "Team Pharrell," Darius Scott performed "On Broadway" against Morgan Frazier, who sang "Even If It Breaks Your Heart." They both received a standing ovation. Gwen admitted she wants to be Darius' stalker because he's that good and Adam called Darius' vocal "ridiculous," saying the mechanics of his singing are the best he's ever heard. Blake told Morgan she blew him away.

Pharrell told Darius he "shared his ambitions with the world in the best melodic way possible," while Morgan made it known this was her big opportunity. In the end, Pharrell picked Darius as champion because he has incredible note intuition and range.

However, Blake opted to steal Morgan back for his own team. He had been hoping to get her back after eliminating her from his team during the "Battle Round." Blake told everyone he previously won the competition with a stolen artist, Craig Wayne Boyd.

About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.