Bayern Munich suffered their first Bundesliga defeat of the season against Hoffenheim just four days after their 7-2 Champions League win at Tottenham.
Sargis Adamyan scored twice for Hoffenheim to secure their first-ever win at Allianz Arena.
Robert Lewandowski had briefly levelled for champions Bayern with his 15th goal of the season.
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Niko Kovac's side stay top but now only on goal difference from Freiburg, RB Leipzig and Bayer Leverkusen.
Bayern Munich's closest rivals Dortmund also drew 2-2 with Freiburg.
Results for Saturday
Bayern Leverkusen 1-1 RB Leipzig
Freiburg 2-2 Dortmund
Paderbom 1-2 Mainz
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