We need the old Del Potro back. The one that won the US Open in 2009.
Unfortunately I don't think we'll see the 2009 Del Potro again. I said it a while ago but it's one of the biggest travesties in the sport that he got the serious wrist injury afterwards. He was rivaling the big guns and managed to win a Grand Slam, something no one other than Rafa, Federer or Novak did from Roland Garros in 2005.
I was little bit angry when he lost to Del Potro, I seriously thought Federer would win and I had high hopes on that happening. I was happy for Del Potro though, it was good to see someone else other than Fed, Djoko and Rafa win a slam.