Kostya Tszyu, coming off a long, injury-related layoff, looked very sharp in stopping Sharmba Mitchell in Glendale, AZ. on Saturday night. Still have to be concerned because a torn rotator cuff is an injury that can re-occur with one missed haymaker, and can keep a fighter on the sidelines for more then six months.*** [details (http://www.boxingscene.com/?m=show&id=224)]