Dave Stieb pitched a four-hitter today for his major league-leading eighth victory, and light-hitting shortstop Alfredo Griffin drove in two runs during a 6-0 victory as the Toronto Blue Jays beat the Baltimore Orioles for the second straight game.

Stieb (8-2) is 5-0 in May and leads the American League in earned run average, victories, innings pitched and strikeouts. He struck out four and walked one as his second shutout this season lowered his ERA to 1.04. It was only the second time that the Orioles, the top-hitting club in the league, have been blanked this year.

The Orioles have not been kind to Stieb in the past. Beginning the game, he had a 1-6 record against them. "They're one of the toughest teams for me to beat," he said, "so the victory and the fact it was a shutout made it very gratifying."

An ovation from the 20,165 in the stands started for Stieb in the top of the ninth and when the right-hander got the final out, the roar was deafening.

"It kind of made me nervous, hoping that I wouldn't blow it," he said. "I'm happy to see the support I'm getting and the club's getting. It means a lot to us."

Toronto took a 1-0 lead in the second when Griffin's single off loser Sammy Stewart (2-2) scored Barry Bonnell, who had singled and stole second base. Stewart lasted four innings in his first start of the season after 13 relief appearances. He struck out four and walked three.

The Blue Jays made it 4-0 in the fourth on four extra base hits. Lloyd Moseby led off with a double and, one out later, scored on Garth Iorg's double. Griffin tripled in Iorg and Rance Mulliniks' double scored Griffin.

Pinch-hitter Jesse Barfield got a two-out double in the sixth off reliever Dan Morogiello and scored on Willie Upshaw's infield single. Morogiello then issued two walks to load the bases and Moseby drew another walk to force in Upshaw.

The Orioles threatened in the sixth. With one out, Dan Ford and Cal Ripken hit back-to-back singles and advanced on Eddie Murray's ground out. But Stieb struck out John Lowenstein to end the inning. In Friday night's 7-5 loss, Lowenstein was struck out looking with the bases loaded and two out in the ninth.