BASEBALL Detroit Tigers -- Traded 3B Darnell Coles and player to be named later to Pittsburgh Pirates for 3B Jim Morrison. Chicago White Sox -- Activated P Bob James from 15-day DL and Ron Hassey from 21-day DL; optioned P Scott Nielsen to AAA Hawaii. BASKETBALL Phoenix Suns -- Reported June 21 deal in which they traded C William Bedford to Detroit has been modified; the Suns now will receive Pistons' first-round pick in 1988 draft instead of 1989 draft. FOOTBALL Chicago Bears -- Said veteran QB Steve Fuller will have to rest completely for three or four weeks and may have to undergo shoulder surgery that would prevent him from playing this season as result of injury suffered while lifting weights. New York Jets -- Signed RB Dennis Bligen. Philadelphia Eagles -- Traded T Leonard Mitchell to Atlanta for fourth-round draft pick in 1988; signed LB Dwayne Jiles. COLLEGES Maryland -- Track coach Stan Pitts resigned; cross country coach Charles Torpey was named acting head track coach by Athletic Director Lew Perkins. George Washington -- Announced restructuring of men's athletic administrative staff; Ed McKee was named director of sports marketing and media relations, Rob Goodman was named to newly created post of coordinator of sports marketing and promotions and Goodman and sports information director Doug Gould now will report to McKee. Providence -- Named John Marinatto athletic director. Mercy -- Named Drew Marino baseball coach and sports information director. Tennessee -- Announced reinstatement of three members of football team from suspension: DT Richard Cooper, NG Fred Bennett and S Andre Creamer.