I was watching Tennis Channel Academy, and a pro was discussing the "dip drive." He said it is a finishing groundstroke where you will hit down on the ball and crush it (or words to that effect). Is there such a shot? It looked like nothing other than a high, powerful groundstroke, where you start your swing higher. I didn't see why trying to hit down on a ball from deep in the court would be a good idea compared to hitting a hard flat groundstroke. The thing that sounded weird about this is that most people I know who try to hit down on a ball don't do very well. They hit it into the net a lot. The pro describing the shot didn't say what grip is best either. Can anyone explain things better?