I don't see why anyone really wants to see this besides unnecessary hype. Besides the crap loss to Noons, who else did he lose to? Sherk, Sanchez, and Karo. All are/were pretty damn good grapplers. He hasn't fought a decent grappler/wrestler since he left the UFC (unless you count Frank Shamrock which I don't
). GSP would take him down, avoid the subs with ease, and grind out a 25 minutes snorefest decision.
Honestly, there is no reason to think that Diaz would be a legitimate threat to GSP's belt.