Burak Yilmaz and Mehmet Zeki Celik struck after the break to give Lille a 2-0 win at Metz as the northerners opened a provisional six-point gap at top of the Ligue 1 standings on Friday.
The Turkish duo put Lille on 69 points from 32 games, with second-placed Paris St Germain playing their match in hand at Racing Strasbourg on Saturday.
Christophe Galtier's side, who beat PSG 1-0 at the Parc des Princes last weekend, had Mike Maignan to thank for as the keeper saved a first-half penalty and made decisive saves.
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Metz are 10th on 42 points, seven points behind fellow promoted RC Lens who occupy the last Europa League qualifying spot.
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