Angel di Maria scored Paris St-Germain’s second-half winner to give the Ligue 1 champions-elect a ninth successive league victory and extend their unbeaten record.
Zlatan Ibrahimovic side-footed PSG ahead in the second minute, the fastest goal in a Classique since 1985.
Marseille, unbeaten since November, made it 1-1 after 25 minutes through Remy Cabella’s low strike.
But Di Maria accepted an Ibrahimovic pass to steer in the winner.
PSG, who are 24 points clear at the top, are now only 13 games from becoming the first side to go unbeaten through a Ligue 1 season.
Marseille, who gave a debut to on-loan Sunderland striker Steven Fletcher as a late substitute, have not won a home league game since September in 10 attempts.
Relive the closing stages here.