Hard to say, I don't think the 10th round will stard, because Wach's jaw got stuck in the canvas when he gets KO'd.
i know the guy has a huge chin, though its never really been tested If Wlad gets the punches on him early who knows, he certainly ended the last 2 much quicker than normal 4th vs Mormeck and 6th against Thompson I get the feeling Wach's chin is only ok and that Klitschko's power and superiority will lead to a KO around the 6th
i also could see it being real early, kind of like Austin, where the guy is too big and clumsy to get out of the way of Klitschko's punches