Rennes missed the chance to further ease their relegation fears after being held to a goalless home draw by Nantes.
PSG went top of Ligue 1 for the first time this season after title-rivals Lyon lost 2-1 at home to 10-man Nice on Saturday.
Ivory Coast winger Max-Alain Gradel scored for the fourth straight match as Saint-Etienne secured a 3-2 win at struggling Metz.
Nantes eased their relegation concerns with a 2-1 win over an Evian side who are still very much in trouble.
Reims moved six points clear of Ligue 1's bottom three thanks to a 3-1 win over 10-man Nantes on Saturday.
Nantes ended their miserable Ligue 1 run as Yacine Bammou's fifth goal of the season saw off Guingamp 1-0.
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