He's still not grown into himself, so I don't mean No. 1 anytime soon. I'm just very impressed with how he handled Felo and how he gave Nadal fits. There have been a lot of young players who have squelched their talent, but I haven't seen a young player this impressive since, maybe, Nadal.
ETA: I find his game more impressive than Djokovic, Murray or Roddick's.
Tomic's game is much better than Roddick's, true. Roddick is faster and has a much better serve though.
Djokovic is much faster, has a better serve, better backhand and better forehand, better volleys.
Murray is better in every way.