Bradley Barcola scored and Desire Doue had a penalty saved as Paris Saint-Germain held on for a 1-0 win away to Le Havre on Saturday to extend their lead at the top of the Ligue 1 table to four points.
PSG were looking to take advantage of another slip-up by title rivals Lens, who were held to a 1-1 draw away at Strasbourg on Friday to go two games without a win.
Luis Enrique's side duly got the job done with Barcola heading in from a Lee Kang-in cross on 37 minutes for his ninth goal of the season.
It was not a full-strength PSG, with Ousmane Dembele again out injured along with Fabian Ruiz and Joao Neves, while skipper Marquinhos was among the players rested.
Doue came off the bench in the second half and won a penalty with just over 10 minutes remaining, but his kick was kept out by Le Havre goalkeeper Mory Diaw diving to his right.
Diaw also produced a fine reaction save from Nuno Mendes while PSG goalkeeper Matfei Safonov made a key stop to deny Issa Soumare at the other end.
The reigning European champions are gearing up for a Champions League last-16 tie against Chelsea and have now won nine out of 10 Ligue 1 games played since the start of December.
Elsewhere in France on Saturday, Rennes made it two wins out of two under new coach Franck Haise as they beat Toulouse 1-0 in Brittany thanks to Arnaud Nordin's first-half goal.
Monaco got back on track after losing to PSG in their Champions League play-off tie as USA star Folarin Balogun and Simon Adingra scored in a 2-0 win over Angers.
Marseille in fourth play host to third-placed Lyon Sunday in a key game in the fight for Champions League qualification.