Toulouse beat Lyon 2-0 in the French league on Saturday, just the second match the five-time defending champions have lost this season.
Toulouse, which drew 1-1 at Lyon earlier this season, took the lead in the 60th minute when Johan Elmander set up Achille Emana to score past goalkeeper Remi Vercoutre.
In the 82nd, Elmaner shrugged off three challenges to score with a powerful shot past Vercoutre.
Lyon leads with 50 points after 20 rounds. Lens, which drew 1-1 at home with rival Lille, is 14 points behind in second place. Sochaux is third with 33 points after a 1-0 loss at Auxerre.
At Lens, Michel Bastos scored for Lille with a spectacular shot, but Lens leveled in the 86th when Aruna Dindane provided Jussie with a simple finish.
Also on Saturday, it was: Bordeaux 1, Lorient 1; Le Mans 2, Troyes 0; Nantes 1, Nice 0; Paris Saint-Germain 1, Valenciennes 2 and Sedan 2, Nancy 2.
At Nantes, Nice goalkeeper Fabien Barthez kept consecutive clean sheets since coming out of retirement, while striker Luigi Pieroni scored on debut after joining from Auxerre.
Striker Ireneusz Jelen scored Auxerre's winner over Sochaux in the 86th, while Daisuke Matsui scored both goals for Le Mans in its win over Troyes.
At Bordeaux, striker Marouane Chamakh leveled in the 87th for the home side after Rafik Saifi had given Lorient a first-half lead.
Nicolas Marin and Joseph-Desire Job put Sedan 2-0 up after 30 minutes, but Mickael Chretien and Sebastien Puygrenier earned Nancy a draw.
PSG's slump continued with a 2-0 loss to 10-man Valenciennes, its fifth at Parc des Princes this season. Steve Savidan and Sebastien Roudet scored for Valenciennes, with Pauleta replying for PSG.
Valenciennes defender Patrick Paauwe was sent off in the 51st minute for a second yellow card
Savidan scored first in the 61st with a header from a free kick, and Roudet made it 2-0 in the 87th when his shot bounced awkwardly past goalkeeper Mickael Landreau.
Pauleta scored from a penalty kick in the 90th after Mario Yepes was fouled inside the area.
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