Strasbourg have ended Paris Saint-Germain’s unbeaten run after a shock 2-1 victory on Saturday at the Stade de la Meinau.
Goals from Nuno da Costa and Stephane Bahoken gave the home side all three points against the Ligue 1 giants.
PSG leveled through Kylian Mbappe in the first half.
It was PSG’s first defeat since a 3-1 loss to Nice on April 30, after a run of 25 matches in all competitions.
The big spenders’ lead at the top will be cut to seven points if Marseille beat Montpellier on Sunday.
Nuno who broke the deadlock, steering a fine header home from an unmarked position in the penalty area, but PSG levelled thanks to Mbappe’s fifth league goal of the season.
Strasbourg snatched the decisive goal through Bahoken, and held on for a famous victory that lifts them to 14th.