Determining ball calls near the glass

What this lesson covers

Judging whether a ball is in or out when it lands near the intersection of the ground and the glass relies on observing trajectory and spin. If the ball enters the corner and rebounds at a lower angle than its entry trajectory, it likely hit the glass first. Conversely, if the ball bounces upward above its entry height, it hit the ground first. These guidelines apply to most standard shots, though extreme spin can alter the rebound.

Spin serves as a secondary indicator. A ball hitting the glass first typically gains topspin, causing it to stay low and accelerate toward the net. A ball hitting the ground first often retains backspin or slice, which causes the ball to hold its position and slow down. When dealing with the side glass or the fence, where rebounds are irregular, players should prioritize the trajectory of the bounce. If the ball stays low and shoots away, it is usually out. If the ball bounces up and remains playable, the best approach is to continue the point in the spirit of sportsmanship.