For years I been arguing with a friend about whether servers are more effective hitting up or down on the ball. I believe that hitting up on the ball is the answer. My friend contends that John Isner because of his height has a distinct advantage because he is hitting down on the ball. Looking at his footage even he seems to be hitting up by using the cartwheel and the way he explodes up into the air. Can some one suggest definitive proof that I can present to my friend to convince him up is better?
Ralph
Ralph
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