Madison Bumgarner admits at times he wondered whether he would make a complete recovery from injuries sustained in a dirt biking accident. Bumgarner allowed four hits over seven innings to win for the second time since returning from the disabled list, helping the San Francisco Giants defeat the Cubs 3-1 Wednesday and complete a winning homestand for only the second time this season. ''Obviously there's going to be some times when doubt creeps in,'' Bumgarner said.