Press release: Six fighters with a combined 185 professional boxing victories and 148 knockouts will fight for three title belts on SHOWTIME CHAMPIONSHIP BOXING Saturday, Dec. 4, at 9 p.m. ET/PT (delayed on West Coast) from Mandalay Bay Resort & Casino in Las Vegas. In the main event, former World Boxing Association (WBA) Super Featherweight Champion Joel Casamayor (31-2, 19 KOs) will attempt to win his second world title when he steps up in weight to challenge two-time World Boxing Council (WBC) Lightweight Champion Jose Luis Castillo (50-6-1, 45 KO) [details (http://www.boxingscene.com/?m=show&id=345)]