Silva x Sonnen.
Silva, easily. Sonnen winning would be the biggest upset of the history of the sport, Sonnen isn't better than Silva in any area but takedowns. While he can take Silva down a couple of times, I doubt he will be able to do this during five rounds while escaping Silva's submissions.
Silva by TKO
Fitch x Alves
It can go either way, of course, but I think Alves is a better fighter and will win, even though he absolutely has to stop Fitch's takedowns, if he doesn't do that Fitch will grind out a victory by unanimous decision.
Alves by TKO.
Guida x Dos Anjos
If Dos Anjos manages to effectively take Guida down and keep him there I can see him pulling a sub victory, but I think he'll eventually get gassed and Guida will enter in crazy mode like he always does and will pull a split decision victory.
Guida by split decision.
Hughes x Almeida
I don't know. In his last fights Hughes didn't look that much motivated. I believe if Almeida pushes him too hard he will win.
Almeida by UD.
Roy x Dos Santos
Dos Santos by murder. When your opponent is one of the best strikers in the business you're in a bad spot, when your opponent is also taller, faster, stronger and has a big reach advantage over you, you're fucked.
Dos Santos by KO.
It's a shame that the undercard isn't being aired, some great fights in there. I'd love to see Hazelett's fight, this guy can pull some crazy submissions.