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One way of putting pressure on your opponent is to hit the ball as early as possible, thus giving them less time to recover for their next shot.
Hitting the ball before it bounces is called a volley, and by doing this you will be taking it far earlier than if you were to let it bounce.
You have less time to set up for a volley so a shorter backswing is useful as it takes less time to prepare. An open racket face will help us to use the height of the front wall to get the ball deep into the back corners.
A good deep volley will create a platform for you to attack with your next shot, if the ball comes back that is!