Andre Ayew scored twice but missed a penalty as Marseille beat Ajaccio 2-0 in only their second win of a difficult Ligue 1 season.
• European gallery
Ayew was twice denied by keeper Guillermo Ochoa after Johan Cavalli's handball gave OM a 20th-minute spot-kick, but he made amends on the half hour after being set up by brother Jordan, and added a second shortly after half-time to make the game safe.
Montpellier claimed a convincing 3-1 victory over hosts Caen to go level on points with leaders Paris St Germain.
Mapou Yanga-Mbiwa and John Utaka scored within five minutes of each other to put the visitors into a two-goal lead inside 20 minutes.
Joris Marveaux was dismissed after 64 minutes to give Caen hope but instead they fell further behind when Younes Belhanda struck. Benjamin Nivet scored a consolation penalty before the game's second red card was shown to Pierre-Alain Frau to even up the numbers.
Eden Ben Basat's second-half equaliser earned Brest a 1-1 draw at the Stade Chaban-Delmas and denied fellow strugglers Bordeaux a second Ligue 1 victory of the season.
Yoan Gouffran opened the scoring for Les Girondins seven minutes into the second half but they were pegged back 11 minutes later as Israeli striker Ben Basat restored parity. The result left both teams in the bottom five.
Romania forward Daniel Niculae's second-half header earned Nancy their first Ligue 1 victory of the season as they beat Nice 1-0. Niculae, on a year-long loan from Monaco, netted the game's only goal nine minutes after the interval to lift Jean Fernandez's side off the bottom of the table.
Aldo Angoula's stoppage-time equaliser earned Evian a 1-1 draw against Sochaux and kept them out of the Ligue 1 relegation zone. Edouard Butin fired Sochaux in front in the 51st minute before Angoula levelled the scores in the dying seconds to earn last year's Ligue 2 champions a much-needed point.
Laurent Batlles struck the only goal of the game as St Etienne edged past Ligue 1 opponents Valenciennes 1-0, while Pavle Ninkov was sent off in a 0-0 draw between Lorient and Toulouse.