UFC Fight Night 19: Diaz vs. Guillard was a mixed martial arts event held by the Ultimate Fighting Championship (UFC) on September 16, 2009 in Oklahoma City, Oklahoma.

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Main Cast: Nate Diaz, Melvin Guillard, Gray Maynard, Roger Huerta, Carlos Condit, Jake Ellenberger, Nate Quarry, Tim Credeur, Brian Stann, Steve Cantwell

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