OFFICIAL: The Rockets today announced they have signed center Steven Adams to a contract extension. From the start of December, he ranked second on the team in plus/minus rating (+189). Last season, Adams ranked second in the NBA in rebounds per 36 minutes played (14.8 per) of players with at least 15 games played. He also averaged 7.5 offensive boards per 36 minutes played, which is the highest in a season by any player in NBA history with 40-plus games played.