Klitschko would win because he is bigger, and his jab would totally control Haye. I mean Haye definitely has boxing skills, but so does Klitschko, and Haye has as suspect of a chin as Klitschko does. I know that Klitschko can take one or two punches from a big heavywieght hitter, Peters, Brewster, Sanders, but if you hit him too many times he will fall. However how will Haye feel like after he gets hit by a legitimate puncher at heavyweight weight? We don't know, it probably won't be all that bad, but regardless Klitschko will control this fight with his jab, and drop Haye with a right hand or a left hook.