German giants Bayern Munich humbled on a day of upsets

Filip Kostic of Eintracht Frankfurt celebrates with teammates after scoring his team's first goal in the 5-1 rout of Bayern Munich.

(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.

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.