Roger might well be the one to beat indoors,Murray after the USO is going to be on a high.Nadal,will he be ready or need time to get back on top of his best game?Djokovic will be looking to win & i would not put this past him.This is a real hard call who gets to be top dog in London.I would like it to be Murray but i've a gut feeling it might be Djokovic this time.