Bordeaux and Lyon lost Sunday to remain without a win after two rounds of the French league and cast doubt on their title hopes.
Toulouse defeated Bordeaux 2-1 to top the standings on six points level with promoted Caen, which stunned last season's runner-up Lyon 3-2. Lyon has one point and Bordeaux is last without a point.
"The top spot is just a detail. We can't draw any conclusion after two rounds," Toulouse coach Alain Casanova said. "Maybe the big teams are not ready yet. In the long run, Bordeaux will quickly become competitive."
Paris Saint-Germain drew 0-0 with Lille to slip to fourth place with four points.
Last week, Caen beat defending champion Marseille, which also lost 3-2 at Valenciennes on Saturday to drop to 18th place.
"We know that those two big teams are not yet at their top, physically," Caen defender Thomas Heurtaux said. "That's why we said we were lucky to play them in the beginning of the season."
Also Saturday, it was: Nancy 0, Rennes 3; Brest 1, Auxerre 1; Lorient 1, Nice 2; Saint-Etienne 3, Sochaux 2 and Arles-Avignon 0, Lens 1.
The match between Monaco and Montpellier was postponed to Tuesday due to a damaged pitch from heavy rain.
Toulouse midfielder Moussa Sissoko charged down the right flank to feed Norway international Daniel Braaten, who buried the ball past goalkeeper Kevin Olimpa in the 45th minute.
Bordeaux midfielder Jaroslav Plasil leveled with a backheel flick off a pass from Fernando Cavenaghi in the 48th.
Toulouse midfielder Etienne Didot took advantage of some poor marking in the 82nd to collect a pass from Fode Mansare and beat Olimpa for the winning goal.
"There's a real psychological problem in terms of self-confidence," Bordeaux coach Jean Tigana said.
Caen forward Youssef El-Arabi beat the offside trap and chipped goalkeeper Hugo Lloris to score in the second minute.
Lyon striker Bafetimbi Gomis headed in a cross from Jimmy Briand, signed from Rennes in the offseason, to equalize four minutes later.
Caen forward Sambou Yatabare shot past Lloris from close range to give his team a 2-1 lead in the 16th. But Gomis redirected an off-target shot from Brazil left back Michel Bastos to level at 2-2 in the 23rd.
The Lyon defense failed to mark up properly on a free kick from Yohan Mollo, giving Caen midfielder Ismaila N'Diaye enough time to control the ball and fire home in the 77th.
Lyon was down to 10 men when Anthony Reveillere was sent off in the 45th. Reveillere had struggled to contain Mollo and earned two yellow cards for fouls on the Caen winger.
"We must be more consistent," Lyon coach Claude Puel said. "We're aware that we need to raise our game. We mustn't let our opponents have so many opportunities."
Lyon center back Cris and Bastos were replaced in the second half after picking up thigh injuries.
PSG could not find its finishing touch in Lille. Striker Guillaume Hoarau was clean through on goal in the 72nd but shot wide when goalkeeper Mickael Landreau quickly came off his line.
Landreau also saved Lille in the 59th by stopping the ball on the line from a corner by new signing Brazilian midfielder Nene.
"Tonight, we were solid defensively," PSG coach Antoine Kombouare told Canal Plus television. "But we missed the little thing that would have helped us to be efficient offensively."
Tulio de Melo missed a good chance for Lille in the 64th, shooting wide from six yards after the PSG defense had failed to clear a corner.
Nene had PSG's best first-half chance with a strike from the edge of the box that was stopped by Landreau in the 41st.
"The positive today is that we did not concede a goal against a good PSG team," Lille defender Adil Rami said. "They have a lot of attacking options but we managed to contain them."
"Still, a draw at home is never a very good result."
