Buffalo Bills -- Signed FB Mike Pruitt, cut by Cleveland before the start of the season after nine years; put OL Justin Cross on injured reserve.

Miami Dolphins -- Re-signed WR George Shorthose to fill in for Mark Duper (hairline fracture left leg).

Buffalo Bills -- Signed OG Joe DeLamielleure, who played for the Bills 1973-79. The 12-season NFL veteran was released by Cleveland in preseason.

San Diego Chargers -- Reportedly reached oral agreement to buy RB Gary Anderson's contract from the Tampa Bay Bandits pending approval of USFL. BASEBALL

New York Mets -- Announced RP Doug Sisk will undergo surgery on his right elbow for bone chips within the next week and will be lost for the remainder of the season. Sisk was 4-5 in 42 appearances this season with a 5.30 earned-run average. JURISPRUDENCE

Mississippi State -- Reserve LB Stuart Whitener has been suspended from the team after being charged with attempted arson and attempted armed robbery following an incident at a gas station in Columbus, Miss. Whitener, 21, allegedly threatened to set the gas station office afire after the clerk would not let him in. The clerk said Whitener demanded money and, after she refused, he poked the nozzle of a gas hose through the money slot and began spraying gasoline into the office, then threatened to strike a match. COLLEGES

George Mason -- Named Mark Coleman assistant basketball coach. Coleman, who served as assistant last season at Canisius, joins Bob Ward and Jim Emery as assistants to coach Joe Harrington. BASKETBALL

Portland Trail Blazers -- Gave G Clyde Drexler a two-year contract extension.

Philadelphia 76ers -- Signed F Terry Catledge to three-year contract. BOXING

WBC -- Jiro Watanabe floored fellow Japanese Kazuo Katsuma four times and retained his World Boxing Council junior bantamweight title when their scheduled 12-round fight was stopped in the seventh round in Osaka. HOCKEY

Pittsburgh Penguins -- Signed G Gilles Meloche to a multiyear contract.

Montreal Canadiens -- Signed LW Mike McPhee and D Kent Carlson to two-year contracts. TENNIS

Hana Mandlikova -- U.S. Open champion withdrew from the Virginia Slims of Chicago tournament because of strained back muscles. She had been scheduled to play her first singles match last night.