FOOTBALL

Miami Dolphins -- Activated DB Mike Kozlowski (ankle injury); placed DT Bill Barnett (sprained shoulder) on injured reserve list. Denver Broncos -- Signed NT Dallas Cameron. BASEBALL

Minnesota Twins -- Signed C Patrick Dempsey and assigned him to AAA Toledo. Dempsey, 29, is the younger brother of Baltimore Orioles C Rick Dempsey and a former member of the Orioles organization. Cleveland Indians -- Bought contract of RHP Kevin Hagen from St. Louis Cardinals. NBA

Dallas Mavericks -- Signed G Harold Keeling to a 10-day contract. COLLEGES

American College Baseball Association -- Convention of 1,500 college coaches in New Orleans voted to ask for a later signing date for high school prospects; not to ask major league baseball to wait until a player completes four years of college before drafting him; to oppose two plans that would limit the length of college baseball seasons. Indiana (Pa.) -- Named former West Virginia Coach Frank Cignetti as football coach. Notre Dame -- Hired Tony Yelovich as an assistant football coach.Akron -- Appointed Jerry Lasko as a defensive coach. Western Maryland -- Football coach Jack Molesworth resigned.Texas -- Fired offensive coordinator Ron Toman, running backs coach Ronnie Thompson, tight ends coach Ralph Harris and assistant linebackers coach Scott Conley. Named Dwain Painter offensive coordinator. TENNIS

Junior Masters tournament -- In Berlin, Boris Becker defeated Czechoslovakia's Marian Vajda, 6-3, 6-2. Emilio Sanchez of Spain beat Ronald Agenor of Haiti, 6-3, 6-4. Mats Wilander beat Bruno Oresar of Yugoslavia, 6-1, 6-1.