Schalke consolidated second spot and guaranteed their Champions League place for next season with a 2-1 triumph at Augsburg.
Borussia Dortmund missed the chance to go second in the Bundesliga as they drew 1-1 at Werder Bremen.
All the latest transfer news from around Europe, with Chelsea reportedly moving ahead in the race to sign Roma goalkeeper Alisson.
Marcel Risse's late free-kick earned bottom club Cologne a point from a 2-2 home draw with Schalke to keep slim survival hopes alive.
Mainz benefited from a bizarre penalty decision which helped to seal a controversial 2-0 victory over fellow strugglers Freiburg.
Mainz and Freiburg players were hauled back to the pitch after the referee had blown for half-time when a penalty was belatedly awarded via VAR.
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