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Old 10-09-2012, 11:55 AM   #370
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Join Date: Oct 2005
Posts: 34,535

Originally Posted by toly View Post
For explanation of the ball spin direction see please picture below. Observer looks at the top of the ball.

I copied the picture from Rod Cross article, “Physics of the Tennis Kick Serve”,
I am not sure what you are saying. In a topspin kick serve, the strings and the ball move in the same general rotational direction.
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