Photo Tour of the Points of Contact for Five Spin Serves

By Jeff Cooper, About.com Guide

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Twist Serve Point of Contact

Grip: Use the grip closest to the Eastern backhand (moving from Continental) that still allows you to make clean contact with the ball. Moving toward Eastern backhand gives you stronger spin, toward Continental easier contact.
Point of contact: Meet the ball 6-12 inches below the full upward extension of your reach, 6-12 inches to your left, and 3-6 inches behind yourself, as measured by where your head is at the time of contact. Where you toss the ball will be influenced by how much you arch backward and how much you jump upward before swinging.
Striking the ball: Strike the ball with your racquet moving upward from left to right--from what would be 7:00 toward 1:00 on the face of the ball if it were a clock. In contrast to the topspin-slice serve, the twist serve requires the plane of your strings to face somewhat toward the right net post as you strike the ball.

Jeff Cooper
Tennis Guide