All-time great BJ Penn makes his third appearance at featherweight when he faces Dennis Siver at Fight Night Oklahoma City Sunday on FS1. Penn is still passionate about the sport and feels he still has something to offer inside the Octagon.

Watch BJ Penn defend his title when he finished Sean Sherk at UFC 84.

UFC Minute host previews some under-the-radar fights to look out for at Fight Night Oklahoma City.

Fight Night Oklahoma City was announced recently and a host of fights have been revealed. UFC Minute host Lisa Foiles details the fights in today's UFC Minute, including BJ Penn vs. Dennis Siver.

UFC featherweight contender Yair Rodriguez spoke backstage with UFC correspondent Megan Olivi about his dominant win over BJ Penn at Fight Night Phoenix.

Hear from featherweight contender Yair Rodriguez inside the Octagon after his TKO stoppage victory over the legendary BJ Penn at Fight Night Phoenix on Sunday, Jan. 15, 2017.

Watch the Fight Night Phoenix official weigh-in on Saturday, Jan. 14 at 7pm/4pm ETPT live from the Talking Stick Resort in Phoenix, Arizona.

Watch the highlights from the Fight Night Phoenix Open Workouts. Hear from BJ Penn, Yair Rodriguez, Jocelyn Jones-Lybarger, John Moraga and Frankie Saenz and watch their best moves ahead of the big fights on Sunday on FS1.

There a bunch of big fights going down Sunday night in Phoenix, but which fights are the favorites to win Fight of the Night honors? Can BJ Penn and Yair Rodriguez put on a performance to earn the award? Here are some potential candidates.

In the third matchup between UFC legends BJ Penn and Matt Hughes, Penn scored a KO victory at UFC 123. Don't miss Penn's return to the Octagon on Jan. 15.

Watch the Ultimate 8 moments from BJ Penn's historic career. Penn returns to the Octagon on Jan. 15 to take on Yair Rodriguez in the main event of Fight Night Phoenix.