Bordeaux opened a three-point gap at the top of the table with a 2-0 win at promoted Boulogne-sur-Mer, giving the defending champions a fifth league victory of the season. Yoan Gouffran opened the scoring in the 34th minute by heading in a corner from David Bellion for his fifth goal of the season.
Boulogne defender Yoann Lachor then headed into his own net in the 70th minute in a desperate attempt to clear a Yoann Gourcuff free-kick. The win was Bourdeaux's 16th in their last 17 league matches and followed a creditable 1-1 draw against Juventus in their UEFA Champions League opener in midweek.
"It's not always easy to return to the championship after putting in such a good performance in Europe," said Bordeaux coach Laurent Blanc, who started the game with Gourcuff and striker Maroune Chamakh on the bench.
"I'm very, very pleased with the match, the behaviour of the guys who played, of those who didn't and those who came on during the evening. We'll need them all in the coming weeks and over the season."
Unheralded Rennes moved into third spot with a 4-0 win over Grenoble, who remain rooted to the foot of the table without a point, having lost all six games so far. Rennes were 3-0 ahead inside the first 20 minutes.
Monaco moved into fourth spot with a 3-1 win at neighbours Nice with Nene and a brace from Alejandro Alonso securing the three points.