Mixed martial artist Din Thomas knocked his opponent out Saturday night, and offered an encore with another bad ass -- Chris Brown.

Thomas, who made quick work of Gabe Lemley, grabbed the mic after the fight and told the crowd he'd love to take on Rihanna's alleged abuser.

He told the crowd: "It's not cool to put your hands on a woman. So Rihanna, if you want someone to kick his ass, holler at me."