Watch UFC 155: Junior Dos Santos vs. Cain Velasquez II Live Undercard on Facebook/FX

The Ultimate Fighting Championship will host the rematch between UFC heavyweight champion Junior dos Santos versus former champion Cain Velasquez at UFC 155 at the MGM Grand in Las Vegas, on Pay-Per-View Saturday, December 29, 2012.

Before the UFC 155 PPV broadcast begins, the UFC fans can watch free preliminary bouts that will not be aired during the live main broadcast. UFC will show three free UFC 155 bouts online via live stream video feed on their official Facebook page including the return of promising heavyweight prospect Todd Duffee, and the always exciting brawler Leonard Garcia. For those who have cable/satellite the excitement continues, with two full hours of MMA action on FX, featuring four UFC 155 prelim undercard fights, including an exciting match-up between bantamweights Brad Pickett and Eddie Wineland, and a lightweight showdown between two hard hitting fighters Jamie Varner vs. Melvin Guillard.

UFC 155 Dos Santos vs. Velasquez II Facebook (facebook.com/UFC) preliminary undercard fights start at 6:35/3:35 pm ET/PT, followed by two full hours of televised preliminary bouts on FX at 8:00/5:00 pm ET/PT, with the UFC 155 PPV card starting at 10:00/7:00 pm ET/PT.

UFC 155 Junior Dos Santos vs. Cain Velasquez 2 Facebook Live Stream Preliminary Undercard (6:35/3:35P ET/PT)
Heavyweight: Todd Duffee vs. Phil De Fries
Featherweight: Leonard Garcia vs. Max Holloway
Flyweight: Chris Cariaso vs. John Moraga

UFC 155 Junior Dos Santos vs. Cain Velasquez 2 FX Televised Preliminary Undercard (8PM/5PM ET/PT)
Bantamweight: Brad Pickett vs. Eddie Wineland
Bantamweight: Erik Perez vs. Byron Bloodworth
Lightweight: Jamie Varner vs. Melvin Guillard
Lightweight: Michael Johnson vs. Myles Jury