PSG kept the pace up with leaders leaders Lyon after Zlatan Ibrahimovic's penalty gave them a 1-0 win at Saint Etienne.
Caen climbed off the bottom of the Ligue 1 table by producing a shock 4-1 victory at Rennes.
Marseille cut the gap to Ligue 1 leaders Lyon to a single point with a late 2-1 win over Guingamp on Sunday.
St Etienne failed to apply pressure to Marseille as they were held to a goalless draw against Rennes on Sunday.
Zlatan Ibrahimovic's second-half strike saw Paris St Germain defeat St Etienne 1-0 in the Coupe de la Ligue.
Paris Saint-Germain blew a two-goal lead to lose 4-2 at relegation-threatened Bastia.
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