those gyes has nothing to defend,just win some.
but i'm afraid you don't know how wrong you are.
what are you trying to say; we dont need to talk about Paris and Wimbledon here as Federer is last year's winner, same goes for Melbourne and Nadal. how are we supposed to say who can defend his title there in 2011 without even knowing who will win it in 2010
so all this thread is about is the question: Can Del Potro win in New York again? and I assume January is not the perfect time to ask this