After a two-year absence from the game, Skiles came to the Chicago Bulls as head coach in 2003. He immediately focused on improving the young Bulls' defense and developing greater consistency in a talented but underachieving team. In the first full year under his direction, Chicago limited its opposition to an NBA-best .422 field goal percentage and held their opponents to a franchise record and league high 26 straight games below 100 points. An NBA best 13–3 mark in January 2005 earned Skiles the NBA Eastern Conference Coach of the Month honor.