Bruce Bochy all but had his mind made up days ago: Madison Bumgarner would hit in an AL ballpark for interleague rather than using a designated hitter. All the San Francisco Giants manager had to do was ask the ace pitcher himself, knowing full well the big left-hander would want to swing the bat. Bumgarner doubled leading off the third inning of the finale of a four-game series against lefty Dillon Overton and the Oakland Athletics on Thursday night as San Francisco tried to avoid a sweep.