In a word... terrible. Vitali's too old and stiff to compete at MMA... the only thing in his favor is his size and his ability to take a punch. Wladimir would probably fare even worse. He's managed to protect his chin in fights after his nasty KOs at the hands of Sanders and Brewster. But one wayward roundhouse kick, and you'd have to wheel Wlad out in a stretcher. His pawing, jabbing tactics would only buy him so much time in an MMA fight. Bad match of styles for both of them.