SEATTLE -- Little-used Greg Dobbs is getting used to his role.
The Mariners loaded the bases off Street (1-1) on singles by Adrian Beltre, Raul Ibanez and pinch-hitter Jeremy Reed. With two outs, Dobbs, batting for Miguel Olivo, hit a sinking liner that a diving Eric Byrnes couldn't catch in left field. The ball rolled past him and all three runners scored to give the Mariners a 7-4 lead.
"I know I haven't had many hits in the at-bats that I've had, but I've felt I've had quality at-bats," said Dobbs, who signed with the Mariners in May, 2001, after a collegiate career at Oklahoma.
"I've taken good swings on good pitches," he said. "If I can do that on a consistent basis, I feel I'll have good chances. The hits will come, especially in the situation like I'm in. I understand the odds are against me, but I don't let it get me down mentally."
A's manager Ken Macha didn't fault Byrnes for not making the catch.
"He was trying to put a zero up there," Macha said.
Street gave all the credit to Dobbs.
"It was a perfectly placed ball," Street said.
Joel Pineiro (1-1), making his second start of the season, got his first win since July 25 against Anaheim -- his last start in 2004 because of a strained right elbow.
Eddie Guardado gave up Erubiel Durazo's first homer of the season in the ninth before finishing for his fifth save.
Bret Boone gave the Mariners a 4-0 lead in the first with his sixth career grand slam, the first grand slam given up by 2002 AL Cy Young Award winner Barry Zito. It came after the Mariners loaded the bases on a walk to Randy Winn, a single by Beltre and a walk to Richie Sexson.
Zito, who is off to an 0-3 start with a 6.94 ERA, went six innings and threw 116 pitches in his fourth start of the season. He allowed four runs on eight hits and three walks, with six strikeouts. Zito has allowed four homers this season.
"I don't think Barry had his best stuff tonight, but I think the great pitchers of the game have the ability to go out there without their best stuff and still keep their team in the game," Boone said.
Boone said he hit a 3-1 fastball over the left-field fence into the A's bullpen.
"He gave me a pitch and I didn't miss it," Boone said. "He left it up a little bit. But I don't know what he's going to throw me. He'll throw me a 3-0 changeup if the situation is right."
Zito said he didn't have his best control and it hurt him.
"I was just trying to pinpoint the location a little too much," he said. "I was not being aggressive in the zone."
Marco Scutaro tied the score at 4 for the A's in the sixth with an RBI single.
Scutaro also had an RBI single in the second, when Oakland scored its first three runs. Mark Kotsay doubled in Oakland's other two runs in the inning.
The A's got a run off the Mariners' bullpen in the eighth. They loaded the bases off Jeff Nelson on a single by Mark Ellis, a walk to pinch-hitter Bobby Kielty and Scutaro's third single of the game. Ron Villone hit Kotsay in the hand with the bases loaded, forcing in Ellis for Kotsay's third RBI of the game to make it 7-5.
But Villone got Jason Kendall to pop out to second baseman Boone and struck out Eric Chavez looking to end the eighth.
Villone said he wasn't rattled when he hit Kotsay.
"It might have rattled him," Villone said. "But that's not the idea, especially with the bases juiced and stuff. I was just trying to get a groundball double play."
The crowd of 24,841 was the lowest at Safeco Field, which the Mariners moved into July 15, 1999. The previous lowest was 24,848 on June 1, 2004, during Seattle's 99-loss season.
Boone has 997 RBI as a 2B. Only a dozen 2B in major league history have 1,000 or more RBI, including No. 12 and newly elected Hall of Famer Ryne Sandberg, with 1,007. Boone got his first grand slam since July 19, 2004, against Boston. ... Zito passed Rollie Fingers for No. 5 on the Oakland A's career strikeout list at 789. Fingers had 784. ... Dobbs is 2-for-7 as a pinch-hitter this season. Dobbs made his Seattle debut with a pinch homer off Cleveland's Bob Wickman Sept. 8, 2004. ... Ichiro Suzuki of the Mariners struck out twice for the first time since Sept. 30, 2004.