After Neymar had an early completion precluded for offside, Denis Bouanga gave St Etienne a 23rd-minute lead.
Timothee Kolodziejczak was shipped off for a foul on Kylian Mbappe and Marquinhos headed PSG level from the subsequent free-kick before half-time.
Holy messenger di Maria nestled into 11 minutes left and Marquinhos added a third for the guests in added time.
Bouanga's opener, affirmed by VAR after at first being hailed offside, was the eleventh time Mauricio Pochettino's PSG have yielded the initial objective in the association in 2021 - their most elevated count in a schedule year starting around 2012.
That was notwithstanding a presentation for previous Genuine Madrid safeguard Sergio Ramos, showing up for the club since his move in July.
Lionel Messi, who helped every one of the three of his side's objectives, rejected a brilliant opportunity to put the guests ahead halfway during that time half when he shot wide subsequent to following up Neymar's saved endeavor.
Be that as it may, he offered to set things right, creating an astounding pass with the outside of his boot to set up Di Maria prior to intersection for Marquinhos as PSG extended their benefit after second-put Decent lost 1-0 to Metz on Saturday.
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