Fair enough, but for a guy who's been absent from the tour for almost 2 years, I think Del Potro is heading in the right direction. If they're was any member of the top 5 that he had a legitimate chance of beating, it was Wawrinka because he's a roller coaster performance wise. While I don't think Del Potro played his best ever earlier today, I think he put a solid enough performance that he can build on and perhaps surprise us all and make the QF. He served very well, forehand was good and his net game was decent. Sure his backhand isn't what it used to be, but since he came back, he's been doing a respectable job of hiding/playing around that weakness.