The Rockets ranked ninth in the NBA in scoring and field-goal percentage last season. But they ranked 21st in opposing field-goal percentage and 26th in forcing turnovers.

But with so much quickness in the backcourt and a presumed defensive specialist in the middle, the Rockets found not just room for improvement, but a way to improve. Mobley and backcourt mate Steve Francis said they have become more defensive-minded and will take that attitude into the season starting Tuesday against the Atlanta Hawks. Center Kelvin Cato has been a far more disciplined and reliable stopper.