Brazil striker Neymar broke Troyes’ resistance as Paris St-Germain took a 10-point lead in Ligue 1 while Monaco lost ground by losing to Nantes.
PSG wore down Troyes to win 2-0 thanks to second-half goals from their world-record signing and Edinson Cavani.
Lucas Lima’s goal in the 92nd minute gave Claudio Ranieri’s Nantes a dramatic victory that pushed Monaco down into fourth place.
Marseille won 3-0 at Metz to go second above Lyon, who lost 2-1 to Lille.
Cavani had a first-half penalty saved by Troyes keeper Mamadou Samassa but Neymar broke the deadlock after 73 minutes with a left-footed shot from outside the box for his eighth goal of the season.
Then at the end of normal time, Cavani made amends for his spot-kick profligacy with his 17th of this Ligue 1 campaign.