World Series of Fighting, also known as WSOF, is an American mixed martial arts (MMA) promotion based in Las Vegas, Nevada. The inaugural WSOF event took place on November 3, 2012 and the main card was broadcast on the NBC Sports Network.

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.

UFC Fight Night 21: Florian vs. Gomi was a mixed martial arts event held by the Ultimate Fighting Championship on March 31, 2010 at Bojangles Coliseum in Charlotte, North Carolina, This was the third time the UFC held an event in Charlotte, but the first since UFC 5.