Union Berlin retained their surprise Bundesliga lead on matchday 7 with a 2-0 victory over lowly Wolfsburg on Sunday. Jordan Siebatcheu opened the scoring with a glancing header into the far right corner in the 54th minute off attacking partner Sheraldo Becker who then wrapped up matters with 13 minutes left after controlling a pass from Paul Seguin with his shoulder. Janik Haberer had a first-minute volley saved by Koen Casteels and the Wolfsburg goalkeeper was also on his guard against Timo Baumgartl who made his first start in a return from testicular cancer. Siebatcheu aimed inches right s…