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

Jeremy Stephens is an American professional mixed martial artist and professional boxer who competes in the Lightweight division. A professional since 2005, he spent 15 years and competed in 33 bouts in the UFC's Featherweight and Lightweight divisions and also spent time in the Professional Fighters League (PFL).