Bayern Munich fell to their first defeat under Pep Guardiola, as Jurgen Klopp's Borussia Dortmund defeated them 4-2 in the German Super Cup.
In an intense encounter, a brace from Marco Reus helped his side go some way to avenging their 2-1 Champions League final defeat to Munich at Wembley earlier this year.
Bayern had Tom Stark in goal in the absence of Manuel Neuer, and Stark was at fault for Dortmund's opener as he had failed to hold on to a Sven Bender header and Reus headed in within just six minutes.
Dortmund, who were in Bayern's shadow as the Bavarians claimed the treble last season, held their lead until half-time. However, just eight minutes after the break Arjen Robben headed in from the far post following a perfectly weighted cross from Philipp Lahm.
BVB then took a stronghold on the game as they scored two in two minutes.
Daniel van Buyten put Dortmund back in front with an attempted clearance that turned in an own-goal from an Ilkay Gundogan cross. The German midfielder then put them two ahead with a fine solo effort and a curling his shot inside the far post.
Robben scored again to half the deficit in the 64th-minute as Lahm assisted him again before he drilled a shot in.
Summer signing Pierre-Emerick Aubameyang then helped secure the victory when he set up Reus to redouble the lead in the 86th minute.
"The game was simply brilliant," said Dortmund coach Jurgen Klopp. "To have won it is just awesome."
The defeat ended Bayern Munich's impressive pre-season run in which they amounted 61 goals in nine games under Jupp Heynckes' successor.
"I don't have the feeling that they played much better than us," Guardiola said.
"It's football. It can happen. We played well, we did things right. We played against a strong team, who played the Champions League final. But I'm pleased for my players. It's a good lesson for us. After one month, I am very happy with our performance."
"We wanted to win and it didn't work out," said Bayern captain Philipp Lahm. "It can happen. They scored four goals and we two."
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