BASEBALL Seattle Mariners -- OF Jeffrey Leonard was "placed on waivers for the purpose of giving him his unconditional release." Club exercised its option to buy out his contract for $150,000. He would have been paid $1.1 million next season if he had been re-signed or reached 550 plate appearances this year. He finished with 525 appearances after being benched often late in year.

FOOTBALL Los Angeles Raiders -- Quarterback Bobby Hebert has filed a lawsuit against the team, claiming it did not sign him because of NFL guidelines he contends are illegal. Hebert's five-year contract with New Orleans expired in February and, unable to reach a new agreement with the Saints, he has not played this season. He contends in his suit the Raiders told him they would have signed him, but were prevented from doing so by the NFL's system of first refusal-compensation. Hebert claims the Raiders violated his rights under the California Business and Professions Code because the NFL rule they invoked is illegal.

MOTOR SPORTS Valvoline Runoffs -- Randy Canfield of Gaithersburg won national championship in H Production class at Road Atlanta raceway in Braselton, Ga. Canfield drove his 1960 Austin Healy Sprite to his fifth national title, averaging 82.13 mph in the 18-mile race. He completed the 45.36 miles in 32 minutes 57.7 seconds. Kent Prather of Woodbridge won the G Production class, driving his MG A an average of 87.85 mph to finish in 30 minutes 58.7 seconds, just .168 seconds ahead of the second-place finisher.

COLLEGES Soccer -- George Washington routed Rhode Island, 10-0, yesterday. Rod Gee and Khalid Jiha each scored two goals for GW (6-4-4, 2-0-2) and Gary Walker had a goal and two assists. In the Umbro Classic in St. Louis, Jason Huber scored at 30:54 to lift 11th-ranked St. Louis to a 1-0 victory over Howard. Loyola (Baltimore) defeated Illinois State, 4-0, in tournament's other match. In Williamsburg, Jim Hauschild (Churchill High) gave William and Mary a 1-0 lead and teammate Dave Visocivch scored early in the second half as the Tribe scored a 2-1 win over American (10-6, 1-3). AU now has lost four in a row. Navy scored three goals in the second half en route to a 3-1 win over West Chester.