The pressure is on! Just four spots remain in the X Factor 2013 Top 16. Last week Demi Lovato completed her girls team and Kelly Rowland selected her top for Over 25s. This week Paulina Rubio and Simon Cowell get the hot seat as the mentors for the Boys and Groups teams, respectively. Like Demi and Kelly before them, Paulina and Simon must each cut six acts who will advance to the live rounds.

Last night, Paulina nailed down her final four boys, and now it's Simon's turn to make the tough decisions. Who will make his team? Contenders include girl group RoXxy Montana, musical (and romantical) duo Alex and Sierra. Wednesday, the first four teams in Simon's top 10 performed, with country group Restless Road easily stealing the spotlight. As one of the manufactured groups created, they're the ones to beat. But they're not in yet. Six more groups will compete to steal a spot in the final 16 and a chance to perform live.

Check back here often as we live update with performance videos from Week 2 of the 4-Chair Challenge and let us know if you think the judges made the right cuts!

Al Calderon sings Carly Rae Jepsen's "Call Me Maybe"


Isaiah Alston sings Whitney Houston's "Greatest Love of All"


Isaac Tauaefa sings Colbie Caillat's "Bubbly"


Carlos Guevera sings Bill Withers's "Ain't No Sunshine" 


Stone Martin sings Natalie Imbruglia's "Torn"


Chase Goehring sings B.o.B's "Airplanes"


Tim Olstad sings Miley Cyrus's "The Climb"


Carlito Olivero sings Selena's "Dreaming of You"


Timmy Thames sings "New Girl in Town"


Josh Levi sings Bonnie Raitt's "I Can't Make You Love Me"

Groups

Girls United sings Chris Brown's "Yeah 3xz"


Wild Thingz sings LMFAO's "Party Rock Anthem"


Glamour sings "You're Gonna Miss Me (Cups Song)" from Pitch Perfect


Restless Road sings Keith Urban's "Somebody Like You"


Sweet Suspense sings "Wishing on a Star"


Yellow House Canyon sings "Hell on Heels" by Pistol Annies


Forever in Your Mind sings Jonas Brothers' "Love Bug"


Good News sings Fleetwood Mac's "Landslide"


Alex and Sierra Sing "You're The One That I Want" from Grease


RoXxy Montana Sings Michael Jackson's "Man in the Mirror"