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Old 03-04-2009, 12:37 PM   #5
tennisnut16
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Join Date: Mar 2009
Location: Ottawa, Ontario
Posts: 170
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pros use pronation and they also contact the ball with their racquet slightly to the side, not straight up from their arm.
http://www.youtube.com/watch?v=7bsYF...eature=related
http://federermagic.blogspot.com/200...-analyzed.html (look at picture 5)
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