Beatdown (movie, 2010)

Brandon, a respected street fighter, is forced to flee the city after his brother is murdered and the money that was supposed to be paid back to a local gangster is stolen. While lying low at his father's house in a small Southern town, Brandon soon gets involved in the local underground cage-fighting circuit. With the help of Drake Colby, a former MMA champion, Brandon devises a scheme to bring a massive payday, if they are able to survive.