German BundesligaDortmund 1-0 Hertha BerlinFreiburg 0-0 Bayern MunichMonchengladbach 2-1 KaiserslauternWerder Bremen 3-1 HamburgLeverkusen 4-1 AugsburgHERTHA Berlin succumbed to their sixth straight defeat in 2012, although there were plenty of positive signs for their new coach Otto Rehhagel in a narrow 1-0 loss to league leaders Borussia Dortmund at the Olympiastadion.The home side, led on the touchline by Rene Tretschok and Ante Covic following the dismissal of Michael Skibbe last weekend, wasted numerous chances against the defending Bundesliga champions, who claimed a fifth successive victory thanks to Kevin Grosskreutz’s 66th-minute goal.Bayern Munich saw their title challenge suffer a setback as they were held to a 0-0 draw by struggling Freiburg.It might have been even worse for Bayern as well with Freiburg having the better chances to win the game as they moved off the foot of the table with a well-earned point.Borussia Monchengladbach kept up their unexpected title challenge with a 2-1 victory at Kaiserslautern.Two goals in five first-half minutes from Patrick Hermann and Juan Arango put Gladbach in the driving seat, but a stunning strike from Leon Jessen gave Lucien Favre’s side something to worry about in the second half.But the visitors held on for the win, keeping them just three points adrift of Borussia Dortmund at the top of the table.Werder Bremen won a dramatic northern Germany derby 3-1 to condemn Thorsten Fink to only his second defeat as coach of Hamburg.Marko Marin, Tom Trybull and Marko Arnautovic scored the goals as Thomas Schaaf’s side posted victory at the HSV-Arena.Elsewhere, Bayer Leverkusen bounced back from their midweek Champions League disappointment by keeping up the pressure on fifth-placed Werder Bremen with a convincing 4-1 victory over Augsburg.