A remarkable turnaround by Tim Kleindienst and his teammates saw Heidenheim snatch victory from Bayern Munich, who squandered a two-goal lead.
This loss effectively extinguished Bayern's slim hopes of defending their Bundesliga title with only six games remaining.
The defeat leaves Bayern trailing leaders Bayer Leverkusen by a significant 16 points, with Leverkusen poised to clinch their first title after the upcoming matches.
Bayern Munich currently sit in second place with 60 points, while Bayer Leverkusen leads with 76. VfB Stuttgart, in third place, has also accumulated 60 points after securing a 1-0 victory over Borussia Dortmund, who have slipped to fifth in the standings.
However, the home team swiftly responded with two goals in as many minutes courtesy of Kevin Sessa and Kleindienst, leaving Bayern stunned.
Heidenheim confidently repelled Bayern's attacks and steadily increased their own pressure. Their efforts paid off when Kleindienst finished a counterattack, securing the club's most unforgettable victory.
Heidenheim, the first newly promoted Bundesliga club to overcome Bayern after trailing by two goals, currently sits 10th in the table with 33 points.
