Ken Singleton had four hits and two runs batted in and Jim Dwyer finished with three hits and two RBI to lead Baltimore to a 9-4 victory over the Seattle Mariners tonight. It was the Orioles' eighth victory in nine games; they remained two games behind Toronto in the American League East.

Dwyer doubled in the first, when the Orioles scored four runs, and had an RBI triple in the fourth.

In his last 13 at bats, he has nine hits, including six doubles, one triple, one homer and 10 RBI.

"I'm just getting a lot of good pitches to hit," said Dwyer. "Maybe they don't want to pitch around me with Cal Ripken and Eddie Murray behind me."

Storm Davis (8-4) pitched his fourth complete game for Baltimore, yielding six hits and striking out nine.

The Orioles' first inning started with back-to-back doubles by Al Bumbry and Dwyer off Jim Beattie (8-6). With two out, John Lowenstein walked and Singleton doubled to score Dwyer.

Former Mariner Todd Cruz then singled to score Lowenstein and Singleton and make it 4-0.

Seattle closed to 4-2 in the second. Richie Zisk singled and scored on Pat Putnam's 11th homer of the year.

In the fourth, Bumbry reached on a fielder's choice and scored on Dwyer's triple. Ripken's RBI single made it 6-2.

Dave Henderson homered in the bottom of the fourth to cut the lead to 6-3. Seattle scored run in the fifth when John Moses walked, went to third on Spike Owen's single and scored on Davis' throwing error.

"It's the worst game we've played since I've been here," said Del Crandall, who became Seattle's manager last month.