In the absence of Messi and Neymar, Mbappe netted his fourth goal on his first appearance at the Parc des Princes since his failed transfer to Real Madrid
Paris St Germain kept their perfect Ligue 1 record intact as they hammered promoted Clermont 4-0 with a brutal display on Saturday.
In the absence of Lionel Messi and Neymar, who were not in the squad after returning late from international duty with Argentina and Brazil, Kylian Mbappe netted his fourth goal on his first appearance at the Parc des Princes since his failed transfer to Real Madrid.
The France striker, who has just recovered from a calf injury, was a constant threat as he added to Ander Herrera's first-half brace with Idrissa Gueye rounding if off after the hour.
PSG, who travel to Club Brugge for their Champions League Group A opener on Wednesday, lead the standings on 15 points with Clermont down to fourth on eight points after their first defeat in their first season in the elite.
"We didn't concede a goal, it was very important against a team who had been playing so well since the beginning of the season," said PSG midfielder Danilo Pereira.
Olympique de Marseille, who have a game in hand, moved up to third on 10 points after their 21-year-old Senegalese striker Ahmadou Bamba Dieng scored in both halves, also hitting the post twice, in a 2-0 win at Monaco.
The principality side, who have already lost three matches, are 14th on four points.
Earlier, the Parc des Princes crowd paid tribute to French film icon Jean-Paul Belmondo and former club defender Jean-Pierre Adams who both died this week with Messi in the stands.
Clermont played their possession game early on but left space on the flanks and Achraf Hakimi made the most of it on the right, managing a powerful cross that was tipped away by Arthur Desmas, only for Herrera to head home in the 20th minute.
The visitors continued to press and created danger in the area, but goalkeeper Gianluigi Donnarumma, playing his first game with PSG at the expense of Keylor Navas, proved solid.
"It was my first game, it was a bit special and we got a perfect result after a good preparation," said the Italy keeper.
"I was a bit emotional to play my first game for the club."
Mauricio Pochettino's side doubled the tally in the 31st minute as Mbappe's cutback was deflected by Florent Ogier into the path of Herrera, who slammed the ball in for his third goal of the season.
Mbappe, the only pure striker in the starting 11, extended PSG's advantage 10 minutes into the second half, finishing off a counterattack after being played through by Julian Draxler.
He was at it again 10 minutes later when his right-footed strike was parried by Desmas, but Gueye was lying in wait and headed into the empty net.