Sochaux stunned Paris Saint-Germain with an unlikely 3-2 home victory to throw open the Ligue 1 title race on Sunday.
Alex gave the visitors the lead against the run of play midway through the first half, but Sebastien Roudet levelled for Sochaux after 36 minutes.
Eric Hely's men played in a manner that belied their lowly position in the league and they took the advantage early in the second half through debutant Giovanni Sio.
But Jerome Roussilon's own-goal brought PSG level in the 76th minute before Sochaux dug deep to find a winning goal from Cedric Bakambu after 84 minutes.
Earlier in the day, Olympique Lyon had reduced the gap behind PSG to three points after a commanding 4-0 away win against Bordeaux.
Midfielder Clement Grenier got the first after 15 minutes before setting up Gueida Fofana in the 65th minute to double the lead.
A flurry of goals was completed a short time later as Grenier scored his second from the penalty spot on 73 minutes before Alexandre Lacazette completed the scoring two minutes later.
The victory snapped a two-game losing streak for Lyon.
In the day's other match, Reims' Gaetan Courtet cancelled out Pierre-Emerick Aubameyang's opener as St Etienne in a 1-1 draw.