Dennis Martinez pitched the Orioles' third consecutive shutout and John Lowenstein homered for the second straight day to lead Baltimore to its fourth straight victory, 6-0 over the Toronto Blue Jays today.

Martinez (4-3) gave up six hits, struck out six and walked two. The Orioles' pitching staff increased its streak of consecutive scoreless innings to 33.

Lowenstein drove in three runs, two with his ninth homer of the season and another with a sacrifice fly.

Lowenstein, a part-time player under Manager Earl Weaver's platoon system, does not believe his recent hitting should make him a full-time player.

"I don't think it would be good for the club if I played full time," said the 35-year-old outfielder. "We have a lot of older players on this club and Earl uses them correctly.

"I think he gets the maximum benefit out of them by using them in situations where they should perform well. The success of any player depends on his athletic capabilities and the strength of the opposition.

"I don't see why I should be playing and have someone sitting on the bench who has proven that he has had good success against a certain pitcher."

Lowenstein, who homered with no one on base Friday, gave Baltimore a 3-0 lead in the first inning when he hit an opposite-field, wind-aided fly ball into the left field seats. Rick Dempsey hit his second homer of the year in the fourth.

The Orioles scored all their first-inning runs with two out against loser Dave Stieb (2-5). Al Bumbry opened with a single and advanced to second on a grounder. One out later, Ken Singleton scored Bumbry on a single, and Lowenstein followed with his homer.

Lowenstein drove in his third run in the third inning. Jim Dwyer led off with a single to left and advanced to third on Singleton's bloop double. Lowenstein made it 4-0 with a sacrifice fly.

Dempsey's fourth-inning homer made it 5-0 and the Orioles added a run in the fifth on an RBI single by Terry Crowley.

"It's just like Earl says, well-pitched games and home runs will win you a lot of ball games," said Lowenstein.