Cologne and Hannover shared the spoils in an entertaining 1-1 draw on Saturday evening but the result does little for either.
Paderborn came back to beat Hannover 2-1 on Sunday to break their 10-match winless streak and climb out of the drop zone.
Paderborn picked up their first win in 2015 with a 2-1 victory over Hannover.
Hamburg made it two wins in a row to pull away from immediate relegation danger by beating Hannover 2-1.
Bayern Munich failed to win for the second match in a row as they were held to a 1-1 draw by Schalke at the Allianz Arena.
Mainz continued their bright start to 2015 with a 1-1 Bundesliga draw at Hannover on Tuesday evening.
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