The Xtreme Fighting Organization held XFO 42 on Saturday, December 10, 2011, at the Sears Centre Arena in Hoffman Estates, Illinois, a suburb of Chicago.
In the main event, veteran Serbian heavyweight Miodrag "Pele" Petkovic broke a 5-fight losing streak with a unanimous decision victory over Team Curran big man and XFO mainstay Mike Marrello. With the exception of 2 fights in King of the Cage, Marrello has fought in the XFO for his entire 17-fight pro MMA career.
Chicago's own Kevin Knabjian broke a 3-fight losing streak with a first-round submission victory over journeyman Brandon Adamson. Chase Beebe's little brother Carson "Little Juggernaut" Beebe won a decision over Lloyd Carter, and Darren Jacoby, twin brother of recent UFC signee Dustin Jacoby, finally won his first pro MMA fight.