The following modifications to illegal-defense guidelines take effect in the NBA preseason:
If two offensive players on the weakside are positioned above the tip-of-circle extended, one of the two defenders may now occupy any area on the weakside, except he may not enter the inside lane other than to:1. Aggressively double-team the ball.
2. Defend an offensive player who is open because of a double-team on the ball, or
3. As a normal reaction to a "ball fake," the defender must immediately return to a legal position or double-team on the ball.
Previously, if two offensive players were positioned above the tip-of-circle extended either on the strongside or weakside of the court, both defenders had to be positioned above the free-throw line extended.