Hertha Berlin and Cologne took a point each from their clash, with the goalless draw seemingly satisfying both sides.
Stuttgart boosted their survival hopes with a 3-2 home win over Werder Bremen, while Cologne saw off Hoffenheim by the same scoreline.
Cologne made what could prove to be a decisive step away from the relegation zone with a 3-2 win over Hoffenheim.
Freiburg beat Cologne 1-0 on Saturday to open clear water between themselves and the relegation zone.
Robert Lewandowski was the difference in the German Klassiker, while there were wins for Monchengladbach and Leverkusen
Cologne came from behind to draw 1-1 against Werder Bremen - their seventh home stalemate of the season.
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