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Old 02-02-2014, 02:52 AM   #2
degrease
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Join Date: Oct 2013
Posts: 209
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As a racket gets older the graphite or whatever "softens" giving it a different feel. James blake also had this problem. I think i read del potro using an old k factor but giving him new ones dont feel the same. Pro's have very sensitive feel so minimal changes they can register
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