Hertha Berlin midfielder Ondrej Duda scored his fifth goal in as many league games on Friday as Bundesliga leaders Bayern Munich suffered a shock 2-0 away defeat.
Hertha deserved the win as captain Vedad Ibisevic converted a penalty before Slovakia's Duda added a stunning second just before half-time.
Niko Kovac suffered his first defeat in nine games as Bayern's head coach ahead of Tuesday's Champions League game at home to Ajax.