Mauricio Pochettino's side - unbeaten in Ligue 1 since October - fell behind to a savvy Randal Kolo Muani finish.
Nantes guardian Alban Lafont was motivated the entire evening and made key recoveries before Quentin Merlin terminated in a heavenly second and Ludovic Blas banged in a punishment.
Neymar struck soon after half-time yet had a manageable punishment saved money at the top of the hour.
Brazilian Neymar's sad exertion was powerless and summarized a testing night for PSG, who were shaken by Nantes' bold first-half methodology.
Much credit should go to manager Lafont, who denied Lionel Messi at 1-0, Kylian Mbappe at 2-0 and afterward stood tall to save and hold another Neymar exertion when the frontman had an age to evaluate an opportunity before the stretch.
That miss from Neymar was additionally rebuffed when Georginio Wijnaldum dealt with nearby in stoppage time, permitting Blas to open up a three-objective lead at the break.
Messi - showing up of his vocation - took care of Neymar in the development to PSG's objective two minutes after the span - and it appeared as though they would gather speed when Dennis Appiah cut down Mbappe in the crate.
Yet, Lafont faced the punishment and has now saved three of the last four spot-kicks he has looked in Ligue 1.
Mbappe botched another sublime open door when a free ball fell his direction seven yards out and Lafont was again close by to dismiss a late strike from Julian Draxler.
Nantes bounce from tenth to fifth in Ligue 1, while Marseille can slice the hole to PSG at the top to 10 places in the event that they beat Clermont at home on Sunday.
blogpay
