Boston Red Sox -- Announced P Joe Sambito, who has had elbow problems for four years, has signed minor league contract. Philadelphia Phillies -- Signed veteran P Dave Stewart to one-year contract after his talks with Japanese team fell through. Detroit Tigers -- Signed free-agent P Bill Campbell to one-year contract. BASKETBALL

Philadelphia 76ers -- Bob McAdoo officially became a member of team because Los Angeles Lakers failed to match the 76ers' $205,000 offer sheet by Thursday night. FIGURE SKATING

European Championships -- Jozef Sabovcik of Yugoslavia, performing a quadruple jump for the first time in major competition, retained his men's title in the event in Copenhagen. He was followed by three Soviets: Vladimir Kotin, world champion Alexander Fadeyev and Viktor Petrenko. MISCELLANEOUS

Olympic Festival -- Amateur Basketball Association of the United States named men's and women's coaches for the eight basketball teams in the festival this summer in Houston. For the men: Digger Phelps of Notre Dame, Bill Foster of South Carolina, Gary Williams of Boston College and Ladell Andersen of Brigham Young. For the women: Sharon Fanning of Tennessee-Chattanooga, Joann Rutherford of Missouri, Tara VanDerveer of Stanford and Annette Lynch of Rhode Island. LOCALLY

Bob James, commissioner of the Atlantic Coast Conference, received the distinguished alumnus award at the University of Maryland's annual football banquet last night. James is a 1947 Maryland graduate.