BASEBALL American League * BALTIMORE ORIOLES -- Agreed to terms with Sam Horn, first baseman, on a one-year contract.
National Basketball Association * LOS ANGELES CLIPPERS -- Fired Mike Schuler, coach. Named Mack Calvin interim coach.
Continental Basketball Association * ROCKFORD LIGHTNING -- Acquired Matt Roe, guard, from the Rapid City Thrillers for an undisclosed amount of cash.
National Football League * LOS ANGELES RAIDERS -- Traded Garry Lewis, cornerback, to the Dallas Cowboys for an undisclosed 1992 draft choice.
* MIAMI DOLPHINS -- Named Dwight Stephenson assistant offensive line coach.
* MINNESOTA VIKINGS -- Traded Jimmy Williams, linebacker, to the Tampa Bay Buccaneers for an undisclosed draft choice.
* NEW ENGLAND PATRIOTS -- Signed Fred Smerlas, nose tackle.
* SAN DIEGO CHARGERS -- Signed Billy Ray Smith and David Grayson, linebackers; Steve Hendrickson and Craig McEwen, running backs; Eric Floyd and Mark Rodenhauser, offensive linemen; and Donnie Elder, cornerback.
National Hockey League * NHL -- Upheld its 10-game suspension against Jaromir Jagr, Pittsburgh Penguins wing, for running into referee Ron Hoggarth in a game played Jan. 26.
* NEW YORK ISLANDERS -- Recalled Dean Chynoweth, defenseman, from Capital District of the American Hockey League. Agreed to terms with David Volek, forward, on a two-year contract extension.
* NEW YORK RANGERS -- Recalled Mark Laforest, goalie, from Binghamton of the American Hockey League. Sent Mark Laforest, goalie, to Binghamton.