Without star player Kylian Mbappé, who left for Real Madrid, Paris Saint-Germain started the French league with a victory.
On a visit to Le Havre, the team of coach Luis Enrique only took a late lead thanks to a number of substitutes: 1-4.
South Korean Lee Kang-in opened the scoring for the Parisians after just three minutes, but defender Gautier Lloris, brother of French record international Hugo Lloris, equalised shortly after the break.
Not much later, a goal from Le Havre striker Josué Casimir was cancelled out on the advice of the VAR.
Reigning champions PSG, with substitutes Ousmane Dembélé, Marquinhos and Bradley Barcola, went in search of victory.
This came in the final phase with goals from Dembélé, Barcola and Randal Kolo Muani (penalty).
