For me there's one problem with Sprott (although I would like to see the fight) - which Sprott is going to turn up?!
He's very much like Danny Williams - they can both turn up in great condition and both train like potential champions, but they sometimes leave their brains in the changing rooms.
This makes fighting them a difficult prospect because you can't be certain what you're up against. A quality fighter should always get the better of his opponent, regardless of any mental inconsitencies they may have, but as Sprott proved against Audley Harrison, he has the power to take anyone out.
I think next year will be a big one for Greenberg, and a loss may actually be good for his career. I would love to see him challange some of the better fighters in the heavyweight division as I do think his speed and footwork can be very exciting.
I also think Greenberg tends to fight to the level of his opponent. He has had some impressive wins against guys the could have been very problematic, but not really impressed against guys he should have put away quickly.
It takes a good smak from his opponent sometimes for him to wake up!
I still think that narring injuries he will challange for the world title within the next couple of years and I would be suprised if he didn't win a veriosn or two of the belt before the end of his career, providing another Mike Tyson doesn't suddenly burst onto the scene.