Saint-Etienne seemed to be awoken by the goal and made a spirited effort to try and level proceedings that came in the 19th minute.
The Saints were awarded a penalty when Mehdi Zerkane brought down Khazri in the area and the Tunisia international stepped out to dispatch home his spot-kick.
Khazri then gave his side the lead four minutes later when he connected with Adil Aouchiche's cross before firing into the back of the net.
The attacker completed his hat-trick in the 72nd minute, converting from the penalty spot after Jimmy Briand was adjudged to have handled the ball in the area.
Lille trace unlikely path towards French title
Issued on:
08/04/2021 - 16:50 Lille forward Jonathan David (2R) celebrates after scoring his team's winner against Ligue 1 title rivals PSG last weekend FRANCK FIFE AFP/File 4 min
Paris (AFP)
Paris Saint-Germain have claimed statement wins in Barcelona and Munich in the Champions League while leaving the door unlocked at home, giving Lille the chance of a first Ligue 1 title in a decade.
Lille stunned PSG in the capital last weekend, winning 1-0 to go three points clear of the reigning champions with seven matches remaining.
PSG have lost eight times this season, while Monaco and Lyon are also within five points of Lille. It is an unpredictable title race, and the fact only the the top three qualify for next season's Champions League adds spice.
Lille trace unlikely path towards French title Paris (AFP) – Paris Saint-Germain have claimed statement wins in Barcelona and Munich in the Champions League while leaving the door unlocked at home, giving Lille the chance of a first Ligue 1 title in a decade.
Lille stunned PSG in the capital last weekend, winning 1-0 to go three points clear of the reigning champions with seven matches remaining.
PSG have lost eight times this season, while Monaco and Lyon are also within five points of Lille. It is an unpredictable title race, and the fact only the the top three qualify for next season’s Champions League adds spice.