0811 GMT October 17, 2019
The Argentine struck with 15 minutes remaining after Marco Verratti's superb through ball allowed Lucas Moura to deliver a telling cross from the left, BBC wrote.
Laurent Blanc's side remains unbeaten this season, with 10 wins and two draws from their 12 matches so far.
Rennes remains seventh but is now without a win in seven games.
PSG will play Real Madrid in the Champions League on Tuesday, and midfielder Blaise Matuidi said former Manchester United winger Di Maria could have a big role to play.
"The goal will do Di Maria a lot of good, he's a great player," Matuidi said. "He just needs to adapt to our league, and I hope he has a great game on Tuesday."
PSG's closest challengers Angers plays today, away at eighth-placed Monaco.