Tyrone Diggs ran for one touchdown and passed for another as Lackey beat Thomas Stone, 21-8, in a Southern Maryland Athletic Conference game last night at White Plains Park.

With their seventh consecutive win, the Chargers, 7-0 in league play and 8-2 overall, clinched the SMAC championship. Thomas Stone dropped to 4-1 and 6-3 and broke a four-game winning streak.

Diggs, who has averaged more than 100 yards a game, picked up 41 on six carries on Lackey's first possession, which he climaxed with a 20-yard sprint around left end with 1:15 left in the first quarter. That touchdown was his 12th. The Charger drive was sustained by two roughing-the-kicker penalties against the Cougars.

Early in the second quarter, Thomas Stone quarterback Rick Jenkins had the ball knocked out of his hands and Lackey recovered on the Cougar 45. Six running plays - including a 13-yard jaunt by Diggs - took Lackey to the Cougar one.

On the first and goal, Charger quarterback Jerry Woodland faked a pitchout to Diggs and dove through the middle of the line. The extra point put Lackey ahead, 14-0.

With the 3:30 left in the half, Thomas Stone defensive back Andrew Curtis cut in front of a Lackey receiver, intercepted the pass and returned the ball 24 yards to the Charger 14. Rusty Conners scored from yard out on a quarterback sneak and passed to John Wilkerson for a two point coversion to make it 14-8 a intermission.

In the opening minutes of the fourth quarter, Lackey's 6-3, 24 pound tackle, Albert Davis, recovered a fumble at the Thomas Stone five. On third down, Diggs threw a five yard TD pass to Brian Smith to sea the victory.

Diggs also intercepted two passed in the contest.