By Jeremy Kahn

SAN FRANCISCO-After seeing his nine-game hitting streak come to a halt on Saturday afternoon, Buster Posey did not take long to start a new one.

Posey went 4-for-4, while Matt Duffy hit a huge two-run home run in the bottom of the first inning, helping the San Francisco Giants defeat the Oakland A’s 4-3 at AT&T Park.

The win by the defending World Champions gave them a series sweep over their Bay Area neighbors from the East Bay. It also marked the fifth straight win for the Giants, as they are 8-1 since the All-Star break.

This was the seventh sweep by the Giants this season, and the first by the Giants over the A’s since May 20-22, 2011.

Tim Hudson picked up his first ever win against his former team, as the 17-year veteran became the 15th pitcher to defeat all 30 major league teams. It was Hudson’s first win since he turned 40 on July 14.

Despite allowing a leadoff walk, Santiago Casilla was able to regroup and get Marcus Siemen swinging to end the game and pickup his 26th save of the season, a new career-high.