OAKLAND, Calif. (AP) - San Francisco manager Bruce Bochy has tried just about everything he can think of to snap the slumping Giants out of their offensive funk. Now general manager Brian Sabean is getting involved.

After the Giants lost their fourth straight game Sunday, Bochy hinted roster changes could be coming for the defending World Series champions.

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``It has to be something that makes sense,' said Bochy following the Giants' 2-1 loss to the Oakland Athletics. ``Last year, we had a couple moves that worked out great. Believe me, these are things he's working on to see what could make sense.'

Something has to change.

San Francisco still has the third-best record in the National League and maintained its 1/2- game lead over Arizona in the NL West.

But with seven losses in their last 12 games, including dropping all three in Oakland, the Giants are struggling.

``No one is happy,' said first baseman Aubrey Huff, who had one of San Francisco's five hits. ``There is doubt about it that no one is where he wants to be. We have to figure ways to score, and it's going to be no easy task. We have to start working counts, getting on and putting pressure on the other guys.'

The Giants didn't do much of that against Oakland starter Trevor Cahill, then paid for it when Landon Powell hit a tiebreaking home run in the eighth inning, his first homer of the season.

Powell, making a rare start in place of catcher Kurt Suzuki, was hitless in two at_bats against Cain before hitting going deep off reliever Jeremy Affeldt (1-1).

``It was supposed to be a sinker down,' Affeldt said. ``Obviously it was the wrong pitch. I think I could have thrown it a little further away from him. He just got the barrel on it and lifted it.'

Cahill (7-5) pitched eight innings to win for the first time since May 9. Oakland's right-hander, who was 0-5 in his previous seven starts, pitched out of jams in the second and third to help the A's extend their season-high winning streak to five.

Aaron Rowand had an RBI double for San Francisco.

Cain allowed only three hits, had five strikeouts and didn't walk a batter for only the second time this season. But with the Giants' offense still sputtering with runners in scoring position - they are 0 for 26 over the last four games - it wasn't enough.

Cain gave up a leadoff single to Weeks in the first - the only hit Oakland got until Weeks doubled with one out in the sixth. In between, San Francisco's right-hander retired 14 straight during one stretch, including designated hitter Hideki Matsui, who twice popped out weakly to second.

``He did a great job of mixing speeds and locations,' Powell said of Cain. ``Every at-bat he showed guys different stuff. He didn't give us anything easy.'

Weeks had three hits, his fifth multi-hit game since being called up from the minors on June 7. That helped Oakland complete a 5-1 homestand, the team's best since 2006.

Brian Fuentes pitched a 1-2-3 ninth for his 12th save in 15 chances. Fuentes struck out Cody Ross looking to end the game, and the Giants outfielder angrily reacted.

Powell's homer, only the 10th of his career, spoiled what had been a pitching duel between Cahill and Cain. It also gave Cahill a victory after he was on the hook for a no-decision.

Cahill scattered five hits and had seven strikeouts. He had been 0-5 with a 5.67 ERA in his previous seven starts before putting the clamps on the Giants.

The A's broke through after Weeks' double, however. The speedy Weeks moved to third on Cliff Pennington's groundout and scored on Coco Crisp's single to right.

Weeks, who had two of the hits off Cain, has been a big lift to Oakland's lineup. He batted leadoff for the second straight day and collected his fifth multi-hit game to raise his average to .364, leaving the A's in a potential quandary when second baseman Mark Ellis is eligible to come off the disabled list next week. Interim manager Bob Melvin said prior to the game that the situation will ``work itself out.'

Notes: IF Mike Fontenot has been slow to recover from a groin strain and might not begin a rehab assignment until next week. ... Oakland RHP Rich Harden (strained right shoulder) will make his first rehab start for Triple-A Sacramento on Monday. ... Leadoff hitter Andres Torres is in an 8-for-45 slump after going hitless in four at_bats Sunday.