Originally Posted by sureshs
Then you better file a case against Federer, because he has been using a special open pattern in the sweetzone.
What's so special about it?
His racquet has equal string spacing in the sweetzone. It was the retail version of the nCode90 that had denser string spacing in the sweetzone than the rest of the stringbed. So there was never anything "special" about his stringbed. It was the retail nCode90 that had a "special" stringbed.