Greg Oden was arrested in Lawrence, Indiana, early Thursday for allegedly punching his ex-girlfriend, according to authorities. The incident took place at Oden's mother's home, police said, and the NBA player admitted to wrongdoing when authorities arrived on the scene at 3:30 a.m.

According to the Indianapolis Star, police "observed blood, swelling to the nose, lacerations to the forehead and nose area of the victim's face." They also "observed blood on the sofa and floor in the sitting area. (They) observed (blood) on the living room carpet (and) dirt from a flower pot that was knocked over."

Police said Oden was calm, cooperative and apologetic.

Oden, a 7-foot center, played one season at Ohio State and helped lead the Buckeyes to the national championship game. He was the No. 1 overall pick in the 2007 NBA Draft, one spot ahead of Kevin Durant, who was drafted by the Seattle Supersonics.

Oden has played just three seasons, dealing with chronic knee issues that prompted microfracture knee surgery.

He was out of the NBA in 2013 but attempted a comeback last season with the Miami Heat, playing in 23 games. Oden is a free agent.