UFC 109: Relentless
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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- Keyword: mixed martial arts
- Cast: Randy Couture, Mark Coleman, Chael Sonnen, Nate Marquardt, Paulo Thiago, Mike Swick