Williams appeared in three preseason games for the Spurs, averaging 4.7 points and 1.7 rebounds in 16.3 minutes per contest.
He was a member of the North Carolina Tar Heels 2005 National Championship team. He averaged 13.1 points and 4.0 rebounds in 37 games as a senior at UNC. Over the summer he played with the Golden State Warriors in the Reebok Vegas Summer League where he averaged 6.2 points and 2.2 rebounds in five games.