The PSG hosts were down to 10 men in the 36th when midfielder Marvin Martin was sent off for a stamp on Yohan Cabaye's right ankle. Martin was carried off and replaced by Ezequiel Lavezzi in the 42nd.
PSG coach Laurent Blanc rested Brazil defender Thiago Silva and Uruguay forward Edinson Cavani. PSG clinched its fourth league title on Wednesday despite losing 2-1 to Rennes.
Saint-Etienne made up ground in the race for the last Champions League berth by moving within two points of third-place Lille with a 3-1 win at Nantes. The team finishing third qualifies for the preliminary round of the Champions League.
Saint-Etienne striker Mevlut Erding opened the scoring by nodding in a free kick from Max-Alain Gradel in the 10th. The visitors took a 3-0 lead with a penalty from Gradel in the 23rd, and a curling shot from Erding on the stroke of halftime. Nantes winger Serge Gakpe scored late.
Second-place Monaco, already assured of a Champions League, beat relegated Valenciennes 2-1.
Fifth-place Lyon's lead over Marseille was cut to one point in the race for the last Europa League spot.
Lorient edged Lyon 1-0 with a low strike from midfielder Cheick Doukoure in the 53rd. Lyon was down to 10 men from the 13th when defender Mouhamadou Dabo was red-carded for tripping Bryan Pele.
Marseille drew 1-1 at Bordeaux. Marseille midfielder Benoit Cheyrou headed in a cross from Brice Djadjedje in the 31st before Bordeaux striker Cheick Diabate equalized with a close-range effort in the 66th.
French Cup winner Guingamp secured safety by beating mid-table Toulouse 2-0.
Evian and Sochaux were the only teams still under the threat of relegation and will meet in the last round next Saturday.
Evian downed Nice 2-0 to stay 17th, one point clear of Sochaux.