War Machine, the man formerly known as Jon Koppenhaver, will lock horns with EliteXC and Bellator Fighting Championships veteran Mikey Gomez in the main event at Xtreme Fighting Championships 9 “Evolution” on Saturday at the St. Pete Times Forum in Tampa, Fla. The event will air live on HDNet at 9 p.m. ET.

Machine will carry a four-fight winning streak into the bout and has not tasted defeat since he was choked unconscious by a Yoshiyuki Yoshida anaconda choke at UFC 84 in May 2008. One of the sport’s polarizing figures, the brash 27-year-old welterweight last appeared at Total Combat 33 in July, when he submitted Erik Montano with a third-round armbar. Spawned by Season 6 of “The Ultimate Fighter” reality series, he still has never gone to a decision in his 11-fight professional career. A bloody and memorable technical knockout victory over Jared Rollins at “The Ultimate Fighter 6” Finale highlights his resume.

Gomez, meanwhile, has lost three fights in a row, two of them finishes. The 27-year-old holds a submission victory against UFC veteran Matt Brown. Gomez has not competed since he dropped a unanimous decision to Jesse Juarez on the Bellator circuit three months ago.

Xtreme Fighting Championships 9: Evolution
Saturday, Sept. 5
St. Pete Times Forum
Tampa, Fla.

War Machine vs. Mikey Gomez
Jason Goodall vs. Pablo Alfonso
Tim Snyder vs. Bruce Connors
Jeremy Thurlow vs. Julien Williams
Nate Jolly vs. Frank Santore
Chris Barnett vs. Daniel Perez
Hayder Hassan vs. Gerardo Julio Gallegos
Rey Trujillo vs. Shah Bobonis
Jesse Benton vs. Sean Bartlett