Mainz coach Jan Siewert is not thinking about his personal future at the club when they face Union Berlin in a re-arranged Bundesliga match on Wednesday. Second last Mainz are effectively in a must-win situation because a defeat would see them slip nine points behind Union who are in safe 15th place. Cologne in third last, which would earn a play-off tie, are four points ahead of Mainz and bottom club Darmstadt who occupy the direct drop places. Mainz have only one season win from 20 games, whic