Originally Posted by sureshs
Isner mentioned the return of serve as one of the important advantages of his 2 hander. It is a miracle Fed has survived Roddick, Karlovic, Isner and Raonic with his 1 hander.
I think it is his read that is superior, and alone with the great first step Fed actually did a lot of I/O return, immediately putting these guys on defense. If the serve is well placed Fed can also do a great slice return. No body serve can really hurt someone if there is a great slice return.