Well he was just out for 4 months with a serious achilles injury, so don't expect his game to be top notch right away, his serve has never been good though.
Yes, I'm aware that he was injured just a while ago. But the thing is, he "disappeared" after AO 2010. One would expect him to keep improving and build on his great Slam performances, but he just disappeared. It's strange.
And his serve was pretty good. Not like his compatriots Goran and Ivo, but a good shot nonetheless. Better than for instance Del Potro's, a player of similar height and playing style. Now it sucks though.
I do wonder what happened after AO 2010. Just seemed like an average player after that.
Exactly my point. He looked so awesome in USO 2009 and AO 2010 and then he suddenly became average. Surely there must be some explanation... He looked set to be one of the leading players of his generation (and can still be, but doesn't look so promising at the moment).