Watch Michael Chiesa's victory over Jim Miller from their bout in 2015. Chiesa takes on Kevin Lee in the main event of Fight Night Oklahoma City on June 25.

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

Watch all the fighters from Fight Night Oklahoma City weigh-in at Saturday's weigh-in.

In this week's episode of the UFC Rankings Report, Forrest Griffin and Matt Parrino break down the changes in the rankings, including lightweight Kevin Lee's jump to No. 7 and Felice Herrig's move up to No. 10 at 115 pounds.

Check out all the best action from the main event between Michael Chiesa and Kevin Lee at UFC Fight Night in Oklahoma City.

Michael Chiesa is focused on his Fight Night Oklahoma City main event scrap with rival Kevin Lee Sunday on FS1, but the lightweight also has plans to make a run at the 155-pound title.

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 Kevin Lee and Michael Chiesa in the Octagon after Lee submitted Chiesa near the end of Round 1.

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

Preview the main event fight at Oklahoma City, featuring lightweights Michael Chiesa and Kevin Lee.

Watch all the faceoffs from the Fight Night Oklahoma City weigh-ins, including main event rivals Kevin Lee and Michael Chiesa. Don't miss all the action Sunday on FS1.

Kevin Lee discusses his win over Michael Chiesa at Fight Night Oklahoma City and has some words for Tony Ferguson.

Forrest Griffin and Matt Parrino break down the changes in the rankings, including Holly Holm's move up at 135 pounds to No. 2. Plus, a look ahead to the huge lightweight showdown Sunday between Michael Chiesa and Kevin Lee in OKC.

Former welterweight champion Johny Hendricks is feeling right at home in his new weight class of 185 pounds. He's excited to start climbing the ladder toward the title with his next matchup against Tim Boetsch in Oklahoma City.

Kevin Lee spoke backstage after his first-round submission win against Michael Chiesa at Fight Night Oklahoma City.

Emotions are running high between Michael Chiesa and Kevin Lee ahead of their Fight Night Oklahoma City main event matchup this Sunday on FS1. Lee believes he's in Chiesa's head and "Maverick" is planning to destroy on fight night.

Kevin Lee steps up to the main event in Fight Night Oklahoma City to take on Michael Chiesa live on FS1 on June 25.

Watch Tim Boetsch in the Octagon after his win over Johny Hendricks at Fight Night Oklahoma City.