I think Federer's serve (especailly 1st serve) is the best on tour right now. It may not have a pace of Roddick but its accuracy/disguise/variety paralyzes his opponents. However, I think Federer's serve is somewhat under-estimated by players. I think players should consider Fed's 1st serve as Sampras and take some chances. I think players should make a guess and commit to one side.