Lille beat Lens 3-0 in the Derby du Nord at Stade Pierre-Mauroy on Friday night.
Lille and Lens are neighbours from northern France. This was their biggest league clash of the season.
Lille sat third on 15 points. Lens were seventh on 13, with three straight wins.
Play stopped twice for crowd trouble. Flares landed on the pitch early on.
Francois Letexier warned he could stop the game over insults aimed at Florian Thauvin.
Matias Fernandez-Pardo crossed low. Hakon Arnar Haraldsson tapped into an empty net.
A poor Matthieu Udol clearance sent Felix Correia through. He rounded the keeper in the 49th minute.
Ismaelo Ganiou handled in the box. Fernandez-Pardo scored from the spot in the 57th minute.
Lille had 13 shots to Lens' five. Lens failed to score for the first time in 22 matches.
Lille are third with 18 points. Lens sit four points behind PSG, who have a game in hand.
Read the full explainer: the goals, the stats, and what comes next.
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