World Series MVP Madison Bumgarner was roughed up in his exhibition debut, and Marcus Semien hit a pair of home runs as the Oakland Athletics opened their new spring training home by beating the champion San Francisco Giants 9-4 Tuesday. Bumgarner gave up four runs in 1 2-3 innings, allowing Semien's two-run shot in the first. ''Right now I'm not worried about results,'' Bumgarner said. You want to get guys out, but it's more about getting my arm in shape.'' Bumgarner led the Giants to the title last October, giving up just one run in 21 innings against Kansas City.