UFC 155 was a mixed martial arts event held Dec. 29 at the MGM Grand Garden Arena in Las Vegas. The event was headlined by a heavyweight championship bout between champion Junior dos Santos and former champion Cain Velasquez. Velasquez regained the belt via unanimous decision.

Jim Miller's unanimous decision victory over Joe Lauzon won "Fight of the Night" honors. Todd Duffee won the "Knockout of the Night" bonus for his win over Phil De Fries, and John Moraga earned "Submission of the Night" for stopping Chris Cariaso.

Main Card

Heavyweight championship: Cain Velasquezdef. Junior dos Santos
Unanimous decision: 50-45, 50-43, 50-44

Jim Miller def. Joe Lauzon
Unanimous decision: 29-28, 29-28, 29-28

Constantinos Philippou def. Tim Boetsch
TKO, 2:11 of third round

Yushin Okami def. Alan Belcher
Unanimous decision: 30-27, 30-27, 29-28

Derek Brunson def. Chris Leben
Unanimous decision: 29-28, 29-28, 29-28

Preliminary Card

Eddie Wineland def. Brad Pickett
Split decision: 30-27, 28-29, 30-27

Erik Perez def. Byron Bloodworth
TKO, 3:50 of first round

Jamie Varner def. Melvin Guillard
Split decision: 30-27, 27-30, 30-27

Myles Jury def. Michael Johnson
Unanimous decision: 30-27, 30-27, 30-27

Todd Duffee def. Phil de Fries
TKO, 2:04 of first round

John Moraga def. Chris Cariaso
Submission, 1:11 of third round