Marseille scored from their only shot on target to defeat Nice 1-0 at the Allianz Riviera to stay third in the France's Ligue 1 on Sunday.
Morgan Sanson's 42nd-minute goal divided the sides, with Patrick Vieira's men now having gone three matches without a victory in the league.
Marseille's men remain behind Montpellier, who won their fifth match of the season 2-0 against Bordeaux.
Gaetan Laborde put the hosts ahead against his former club in the 17th minute and a 53rd-minute penalty from Andy Delort after a handball from Pablo clinched the points for Marseille.
Rennes hit back strongly after conceding an early penalty to secure a 1-1 draw with St Etienne at the Stade Geoffroy-Guichard, but it could have been more.
Wahbi Khazri picked himself up after being fouled by Clement Grenier to put the hosts ahead in only the fourth minute but Ismaila Sarr equalised in the 34th minute.
Hatem Ben Arfa was then presented with a golden chance for Rennes from the spot in the 66th minute after being fouled by Timothee Kolodziejczak but hit the outside of the post.
Defending champions and runaway leaders Paris Saint Germain continued their dominance with a 5-0 win over Armiens SC.
In other matches, Lyon beat Nimes 2-0, Caen drew 0-0 with Guingamp, Strasbourg beat Monaco 1-0, LOSC scored a 2-1 win over Dijon, Nantes thrashed Toulouse 4-0, Stade Reims drew 1-1 with Angers while St Etienne were held 1-1 at home by Rennes.