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The eighth step of the tennis serve is the swing. From the racket drop, swing up "on edge" at the tennis ball. It should look like you are, initially, trying to frame the ball with the side of your tennis racket. Just before contact, you will pronate with your forearm and wrist. Pronation is covered in the next video. Also, in the racket drop your body is sideways to the net, but as you swing up at the tennis ball you will rotate so that, at contact, you are more or less facing the net.