OAKLAND, Calif. – Dan Haren allowed three hits over seven dominant innings, and Jack Cust hit a three-run homer in the Oakland Athletics’ second straight victory in the Bay Bridge Series, 4-2 over the San Francisco Giants.

While Barry Bonds played in his ninth straight game without hitting a homer, two of the Bay Area’s top young pitchers showed off in front of another Coliseum crowd with divided loyalties – and Cust added another big blast to his remarkable binge for the A’s.

Haren (4-2) retired 15 straight batters after a rocky 33-pitch first inning, giving up his only runs on Bengie Molina’s two-run homer in the seventh. Three relievers finished it off, with Alan Embree pitching the ninth for his first save with the A’s.

But Matt Cain (2-4) nearly matched Haren after Cust’s shot in the first inning, striking out nine and yielding just six hits in 6 1-3 innings.

Bonds went 1-for-3 with a single, but the slugger hasn’t added to his 745 career homers since May 8 against the New York Mets.

San Francisco, which walked 13 batters in a 15-3 loss to the A’s on Friday night, has lost eight of 11, including four of its last five while falling back below .500. Oakland has been similarly mediocre, but the majors’ second-best interleague team has been solid so far against its local rivals.

Haren struck out six in yet another strong outing for the A’s, who haven’t missed injured starter Rich Harden terribly because of Haren and Joe Blanton.

Haren hasn’t allowed more than three earned runs in any of his AL-leading 10 starts while pitching at least five innings in every trip to the mound – but the right-hander got no decision in his three previous starts.

Haren walked two batters and barely escaped the first inning on a bases-loaded grounder by Molina, but quickly found a groove. Just two of the next 15 hitters even got the ball into the outfield before Bonds lined a leadoff single to right in the seventh.

But Molina popped his fourth homer of the season into the left-field stands, and Haren subsequently threw two wild pitches before escaping the inning on a groundout.

Cain, who threw a one-hitter at the Coliseum last May, walked Nick Swisher and gave up a two-out single to Dan Johnson in the first before Cust hit his eighth homer in 13 charmed games since joining the A’s on May 4 after a minor-league trade with San Diego.

Cain didn’t face trouble again until the seventh, when he walked two batters and left with the bases loaded. Reliever Jack Taschner struck out Eric Chavez and got Johnson on a fly.

Cain has lost three of his last four starts.

Jason Kendall drew a bases-loaded walk in the bottom of the eighth to make it 4-2.

Notes: Randy Winn led off the game with a single to extend his hitting streak to 18 games. Winn’s streak is the Giants’ longest since Robby Thompson hit in 21 straight in 1993. … Swisher had his hair cut by his father before the game. His lengthy locks will be donated to a charity that makes wigs for cancer patients. … Cust punctuated his homer with an old-fashioned “Bash Brothers” forearm high-five with Swisher and Johnson.

AP-ES-05-19-07 2347EDT