At net, if the ball is a little lower, it will be easier to put more underspin on the ball for a drop volley. Close in on the net faster for a greater chance of making the shot.

2 hits ground strokes with the best of them. But volleys? Yes, he has those, too. His backhand drop volley is a beauty. The drop volley—I prefer “stop” volley—is a shot that isn’t used ...

When it was first seen in professional tennis, it was viewed as being a shot that was used to show off ... Assuming that it's the former then don't hang around waiting for the applause - your opponent ...