Geographic neighbors seeking to help their own playoff chances while hurting those of the rival go head-to-head Tuesday night when the Oakland Athletics and host San Francisco Giants meet, 30 years after their infamous Earthquake Series. The A's won the temblor-interrupted 1989 World Series in a sweep, and they have dominated recent meetings with the Giants, winning nine of 14 over the past three seasons. Left-handers Brett Anderson (10-7, 3.99 ERA) of the A's and Madison Bumgarner (7-7, 3.74) of the Giants are scheduled to square off in the opener of the two-game set.