UFC 109: Relentless was a mixed martial arts event held by the Ultimate Fighting Championship (UFC) on February 6, 2010 at the Mandalay Bay Events Center in Las Vegas, Nevada.

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Main Cast: Randy Couture, Mark Coleman, Chael Sonnen, Nate Marquardt, Paulo Thiago, Mike Swick, Demian Maia, Dan Miller, Matt Serra, Frank Trigg

Director: Anthony "Pasquale" Giordano

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