Diaz has no boxing at all. He just throws a lot of punches and has a great chin to beat a bunch of mediocre strikers and guys who gas quickly like BJ and Daley. The guy has literally no footwork, no head movement, and his only game plan is to walk toward the other guy and throw punches. GSP on the other hand has great footwork, he has a damn good jab that's going to shut down Diaz all night, and on top of that he has a lot better defense than Nick. Nick couldn't deal with Condit throwing multiple strikes and moving, and unlike BJ and Daley GSP is not going to gas because he's better conditioned and much smarter than that.
On the ground Diaz is good. There's no doubt that he's no joke there, but neither is GSP. GSP has one of the best top games in MMA regardless of whether or not he gets finishes. The guy works out things to a T, and I don't see him getting caught by Diaz there. It's possible, but GSP knows how to stay out of subs.
Also it's funny how it was brought up a few posts above that GSP couldn't finish Hardy. All Hardy did was lay on his back and defend the whole time, but even then it's no big deal. Going by that logic Diaz couldn't beat Condit, or Karo, or Sherk, and GSP beat them all without any doubt.
In before "1,2,5..."