Bayern Munich squandered a two-goal lead to slump to a shock 3-2 loss at Heidenheim on Saturday that all but ended the Bavarians' slim Bundesliga title hopes with six games left to play.
Tim Kleindienst completed a memorable comeback for the hosts in the 79th minute, leaving Bayern 16 points behind leaders Bayer Leverkusen.
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The Bavarians, who take on Arsenal next week in the Champions League quarter-final first leg, have now lost their last two league matches with coach Thomas Tuchel set to leave at the end of the season.
They are second on 60 points, with Bayer Leverkusen on 76. Third-placed VfB Stuttgart, who were in action at Borussia Dortmund later on Saturday, are on 57.
Bayern, winners of the last 11 consecutive league titles, looked to be cruising to a comfortable win after first-half goals from Harry Kane and Serge Gnabry.
Tuchel had demanded a reaction following last week's loss to Borussia Dortmund.
But the hosts struck back with two goals in two minutes - from Kevin Sessa and Kleindienst - to stun Bayern.
Heidenheim comfortably held off any Bayern attack and gradually built up pressure. They were rewarded when Kleindienst completed a counter-attack for the club's most memorable win.
Heidenheim are the first newly promoted club in Bundesliga history to beat Bayern after coming from two goals behind. They sit 10th in the table with 33 points.
Leverkusen are just three points from a first Bundesliga title after a 1-0 win at Union Berlin.
Xabi Alonso's side host Werder Bremen, live on Sky Sports, on Sunday April 14 (4pm UK and Irish time).
What's next?
FC Heidenheim travel to VfL Bochum on April 13 (2.30pm UK and Irish time), while Bayern take on Arsenal in the first leg of their Champions League last-16 tie at the Emirates on Tuesday (8pm), before hosting Cologne in the Bundesliga on Saturday April 13 (2.30pm).
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