del potro's problem is the same problem most of the others have:
all these all time greats are in front of them. Fed, nadal, nole, and andy are all time greats.
how the hell do you get through that steel wall?
it is nearly impossible for the others to win even masters events with these sharks around.
Federer took down del potro twice on the indoor hard courts. once in paris and once at the O2 arena. lets see how it goes at the outdoor hard courts.
del potro has not fared well at the Australian open. maybe he can make some progress this time around.