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Old 10-09-2012, 09:52 AM   #365
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Join Date: Sep 2010
Posts: 1,993

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”,
Anatoly Antipin - one of the most delicate tennis players in the world.
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