He's good enough on clay. Madrid 2009 SF was flawless clay tennis by him, which could easily win him RG, if he can improve his fitness.
Hmm, perhaps.. I'm kinda worried about his health though. I know he's learned to live with his allergies and breathing issues, and he has fought through every match even when he felt bad. But I can't help but to feel it will destroy him one day, especially in Australian Open. He doesn't deal well with the heat, and tt gets REALLY hot down there in summer (January).