Fedor beat Semmy Schilt, who is clearly a crisper striker than Silvia. He also outstruck Gary Goodridge. Silvia is nothing more than a goofball, and only seems good because the UFC has a lack of decent heavyweights.
My opinion, Fedor does his two hook combos that he always does, makes Silvia stagger. At this point, Silvia will grab on Fedor to keep from falling down, or he'll back off all the way to the cage wall. At this point, he gets slammed to the floor, topped off with a Kimura/Tko/Submission Strikes from side control.