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Old 10-06-2012, 11:51 PM   #8
rkelley
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Join Date: Sep 2010
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It's really hard to say anything without seeing your motion, but an important thing to remember is that your "flat" serve should not really be flat - i.e. no spin. It should have some topspin on it to help pull it down into the court. Sampras, Roddick, Fed, etc. all have lots of topspin on their "flat" 120-140 mph serves.
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