PSG, fourth last term before being bought by wealthy Qatari investors and making a host of signings, lost 1-0 to Lorient while Lille drew 1-1 at Nancy and Didier Deschamp's Marseille were held to a 2-2 home draw by Sochaux.
Olympique Lyon were the only winners from France's 'big four' after a 3-1 victory at Nice in Remi Garde's first game in charge.
Lorient's Kevin Monnet-Paquet earlier missed an open goal from two metres as the modest north west side embarrassed their nouveau-riche opponents, who included other new buys Jeremy Menez, Salvatore Sirigu and Blaise Matuidi.
Lille, surprise double winners last term, have also made several new signings but it was old hand Mathieu Debuchy who opened the scoring at Nancy just after the break following Franck Beria's cross.
Marseille's Lucho Gonzalez, who has spent the close-season waiting for a move away from the club, grabbed a 38th minute opener at the Stade Velodrome before Sochaux hit back twice only for Loic Remy to snatch a draw 16 minutes from time.
"I thought we had done what was needed, above all in the first half in terms of our play and the number of chances," Deschamps told reporters.
Montpellier overcame Auxerre 3-1, Caen beat Valenciennes 1-0 in a battle of last season's strugglers and promoted Corsican side Ajaccio lost 2-0 at home to Toulouse.
