Second-place Eintracht Frankfurt suffered their first Bundesliga defeat of the season on Sunday after going down to a shock 2-0 loss at Borussia Moenchengladbach.
Frankfurt's loss means league leaders Bayern Munich, who beat Hoffenheim 2-0 at the Allianz Arena on Saturday, stay five points clear at the top of the table after a German league record-equalling seven straight victories.
Having won promotion from the second division in May, Armin Veh-coached Frankfurt had previously won six of their seven games since coming up, while this was only Gladbach's second league win of the season.
The victory moves Gladbach up to 10th in the table, while Frankfurt stay second.
A wonder goal after only eight minutes from Gladbach's Venezuela veteran Juan Arango, which flew into the left-hand corner from 30 metres out, stunned the guests.
Dutch striker Luuk de Jong then doubled the hosts' lead at Borussia Park when he drilled his shot into the top-right corner on 24 minutes to put Gladbach on the way to three points.
It was the Netherlands international's second goal since joining Gladbach from FC Twente in the summer.
Defending champions Borussia Dortmund have the chance to move up from fourth if they win at Hanover on Sunday evening, while Stuttgart host Bayer Leverkusen.
On Saturday, there was no happy return to Gelsenkirchen for Wolfsburg's ex-Schalke coach Felix Magath as the Royal Blues enjoyed a 3-0 win.
Magath spent two years at Schalke before he was sacked in February 2011, when he returned to Wolfsburg.
Magath's team were well beaten at Veltins Arena thanks to goals by Peru striker Jefferson Farfan, Dutch forward Ibrahim Afellay, and midfielder Roman Neustaedter.
It was Wolves' sixth game without a win and their third straight defeat, leaving Magath's team second from bottom, while Schalke moved up to third.
Hamburg continued their rise up the table with a 1-0 win at Bavarian side Greuther Fuerth thanks to South Korean striker Son Heung-Min's first-half goal.
Mainz enjoyed a 1-0 win at home to Fortuna Duesseldorf, while Freiburg recorded their first win in four games with a 3-0 victory at home to Nuremberg.
On Friday, Werder Bremen lost 3-1 at Augsburg as the hosts enjoyed their first win of the season.