(CNN)German giants Bayern Munich slumped to a humiliating 5-1 defeat at Eintracht Frankfurt Saturday to heap the pressure on coach Niko Kovac after a stuttering start to its Bundesliga title defense.
German giants Bayern Munich humbled on a day of upsets
An early red card for Jerome Boateng presaged Bayern's heaviest league loss in over a decade, leaving Kovac's men fourth in the standings and four points behind leader Borussia Moenchengladbach, 2-1 winners at Bayer Leverkusen.
Boateng was sent off on nine minutes after a VAR review for upending Goncalo Paciencia as the last line of defense and it was not long before Frankfurt's numerical advantage proved decisive.
Filip Kostic capitalized on a defensive error for the opener with Djibril Sow adding a second after Kostic's shot was deflected to him at the far post.
The ever dangerous Robert Lewandowski continued his fine run for Bayern as he beat three men before shooting home from the edge of the penalty area.
It extends his Bundesliga record to scoring in his 10th successive game, but it was as good as it got for his side.
Any hopes of a visitor fightback faded when David Abraham converted a Danny Da Costa cross soon after the restart, with Martin Hinteregger heading a fourth on the hour.
Paciencia completed the rout off an Andre Silva pass to send the 48,000 home crowd home with a famous victory to savor.
For Bayern it was a poor start to a testing series of fixtures, with the visit of Olympiakos in the Champions League in midweek before a heavyweight showdown with arch-rival Borussia Dortmund next Saturday.