St. Etienne climbed to the top of the Ligue 1 table on Saturday thanks to a 3-1 defeat of Valenciennes at the Stade du Hainaut.
The win lifts the club to 12 points on the season, one point better than second-place PSG. Monaco, on 10 points, holds a game in hand and will face Lorient on Sunday with a chance to move back into first place.
Benjamin Corgnet played a starring role in St. Etienne's triumph on Saturday, completing a brace for his first goals of the season. He opened the scoring in the 17th minute to hand the visitor's a one-goal lead by halftime, while a 47th-minute strike from Romain Hamouma and Corgnet's second of the match six minutes later effectively sealed the victory.
Maor Melikson converted a penalty 10 minutes from time for Valenciennes, but it proved to be nothing more than a consolation goal.
Marseille squandered its opportunity to move into first place, instead settling for a point in a 1-1 draw with Toulouse at the Stade Municipal de Toulouse.
Ellie Baup's side let the opportunity slip from its fingertips as Marseille fell behind when Ben Yedder got Toulouse off the mark in the 66th minute.
It looked as though Marseille would come away empty handed, but a late goal from Lucas Michel Mendes three minutes from time helped the club earn a share of the spoils to improve to 10 points.
Toulouse, still winless on the season, remains bottom of the league on three points.
Elsewhere in Ligue 1 action on Saturday, Filip Djordjevic scored the lone goal for Nantes in a 1-0 victory over Sochaux, Kevin Berigaud scored twice in Evian's 3-2 defeat of Ajaccio, Mustapha Yatabare converted a late penalty to give Guingamp a 1-1 home draw against Bastia while Montpellier and Reims split the points in a 0-0 draw at the Stade de la Mosson.