Bayern Munich were held to a goalless home draw by Duisburg but remained on top of the Bundesliga after closest challengers Werder Bremen suffered a 4-3 defeat to Hannover. At Allianz Arena, Bayern failed to break the deadlock even though Duisburg's Mohamadou Idrissou was sent off ten minutes from time. An away win for Bremen over Hannover would have lifted them to the top but they were denied by Mike Hanke's hat-trick. Markus Rosenberg put the visitors ahead after ten minutes but Hanke leveled the score two minutes later. Hannover went ahead through an own goal by Frank Bauman in the 20th minute before Hanke extended the gap just one minute later. A penalty from Brazilian playmaker Diego and a goal from the in-form Rosenberg helped Bremen equalize. Hanke completed his hat-trick in the 77th minute to lead Hannover to a precious victory. Bayern are in charge of the league table with 35 points, two ahead of second-placed Bremen. Hamburg, who were held to a goalless draw by Energie Cottbus, are third on 31 points.