Diaz is definately better the longer a fight goes. His conditioning and ability to take punishment make him extremely dangerous in the latter rounds.
...but goddamn!! He got his shit pushed in. Plain and simple. He came out flatter than Keira Knightley...

...and he got his lunch handed to him like a hobo at a soup kitchen.
Now, I wanted Diaz to win just as much as the next guy, I hate Noons, and Diaz should have been allowed to continue if he wanted to. The cuts were under control, and he had his bearings about him...but that round was definately 10-8 for Noons.