Lens moved into second place in the French first division on Saturday despite being held to a 0-0 draw by visiting Rennes.
Third-place Sochaux drew 0-0 at Nice, while Nancy lost for the third time this season -- 2-0 at Lorient -- and slipped to fourth. Lorient won its third straight game with goals from winger Ulrich Le Pen and Hamed Namouchi.
Also on Saturday, it was: Bordeaux 0, Auxerre 0; Le Mans 1, Paris Saint-Germain 1; Nantes 2, Saint-Etienne 2; and Toulouse 3, Sedan 1.
Bordeaux's draw ended a four-match winning streak at home. Missing striker Jean-Claude Darcheville, Bordeaux fielded veteran Lilian Laslandes in attack, but he was unable to make any impact.
Gabriel Obertan almost won the match for Bordeaux, but the 17-year-old player missed the target with a powerful shot.
Bonaventure Kalou's 10th-minute penalty gave PSG the lead, but Chiguy Luca leveled for host Le Mans in the 37th.
Defender Eric Cubilier gave Nantes the lead in the 39th, and Guinea winger Pascal Feindouno equalized for Saint-Etienne just before halftime.
Nourdin Boukhari looked to have sealed the win for struggling Nantes in the 86th, but Vincent Hognon scored in injury time to earn Saint-Etienne a 2-2 draw.
At Toulouse, forward Johan Elmander scored twice and Fabinho added another for the hosts, with Fabrice Jau scoring a consolation for Sedan.