Do not develop one favourite shot and play nothing but that. If you have a fair cross-court drive, do not use it in practice, but strive to develop an equally fine straight shot.
Remember that the fast shot is the straight shot. The cross drive must be slow, for it has not the room owing to the increased angle and height of the net. Pass down the line with your drive, but open the court with your cross-court shot.
Drives should have depth. The average drive should hit behind the service-line. A fine drive should hit within 3 feet of the baseline. A cross-court drive should be shorter than a straight drive, so as to increase the possible angle. Do not always play one length drive, but learn to vary your distance according to your man. You should drive deep against a baseliner, but short against a net player, striving to drop them at his feet as, he comes in.
Never allow your opponent to play a shot he likes if you can possibly force him to one he dislikes.
Again I urge that you play your drive:
1. With the body sideways to the net.
2. The swing flat, with long follow through.
3. The weight shifting just as the ball is hit.
Do not strive for terrific speed at first. The most essential thing about a drive is to put the ball in play. I once heard William A. Larned remark, when asked the most important thing in tennis, "Put the ball over the net into the other man's court." Accuracy first, and then put on your speed, for if your shot is correct you can always learn, to hit hard.