OP, it is very difficult to unlearn muscle memory in sports. As a kid, my coach modeled my topspin forehand and backhand after Lendl, with the same grips. I now use my game to take time away from guys with extreme grips and big topspin; instead of deconstructing my game to the detriment of my muscle memory, I try to learn new ways of applying my shots effectively. I agree with the Spartak Tennis Club's approach to tennis regarding muscle memory. The New York Times had an interesting article regarding myelin several years ago. http://www.nytimes.com/2007/03/04/sports/playmagazine/04play-talent.html?pagewanted=all&_r=0 John Yandell, is it possible to look at old footage and get topspin RPMs for guys like Borg, Lendl, and Becker?