Alassane Plea's goal earned Nice a 1-0 win over AS Nancy on Sunday that moves them top of Ligue 1.
Mario Balotelli scored twice as Nice beat Monaco 4-0 to go top of Ligue 1, while there were also wins for Lyon and Bordeaux.
Thomas Lemar fired a late double as Monaco moved three points clear of PSG at the top of Ligue 1 with a 3-0 win against Rennes.
Mario Balotelli scored twice on his debut to inspire Nice to a 3-2 win over Marseille.
Paris Saint-Germain suffered their first league defeat since March as Monaco struck an early blow in the Ligue 1 title race.
Gabriel Boschilia's strike gave Monaco a 1-0 win at Nantes on Saturday.