Mbappe scored in the 82nd minute and, with a delightful finish, again in the 90th having come off the bench at half-time for his first appearance since winning the World Cup with France over the summer and being named the young player of the tournament.
Neymar, who continues to be linked with Real Madrid, had equalised eight minutes after the interval with a coolly-taken penalty he won himself, and also provided the assist for Mbappe’s second goal.
Mbappe was quoted by L’Equipe as telling Canal Plus after the game regarding his status at PSG: “Neymar is a superstar, more than me. He worked a lot in Barcelona for that.
“With a goal and an assist, it is not bad either. I try to bring what I can and help the team win.”
Regarding the triumph at the World Cup, the 19-year-old added: “We won, we celebrated but football continues, my career begins, I have very high goals with the Paris SG, with the team of France and at the individual level.
“We don’t have time to sit around.”
Neymar assist, Mbappe goal. 😍How often will we see this this season? pic.twitter.com/82jQLd3p3u
— David Kappel (@kappilinho) August 18, 2018
PSG turned things around after a first half in which they showed little attacking threat and fell behind in the 20th minute via Nolan Roux’s strike.
Prior to that Roux had seen a shot superbly diverted against the crossbar by Gianluigi Buffon, and shortly after the goal Nicolas Benezet thought he had put Guingamp 2-0 up, but his header was ruled out by referee Clement Turpin following a VAR review.
PSG boss Thomas Tuchel, also quoted on lequipe.fr, said after the Ligue 1 clash at the Stade de Roudourou: “It’s not possible to start playing a game as we played in the first half.
“We were not ready for this game here.
“It was clear that Guingamp is a very intensive team that plays with courage and a lot of individual qualities, many aerial battles.
“We were not ready for that, not at all. And we were lucky that the result was not 2-0 or 3-0 (at the break).
“And that’s why we changed a few things (with the introduction of) Kylian, with the organisation, but, most importantly, with another approach to the game.
“There were a lot of problems with our organisation to attack, to defend, and on the other hand the situation is still complicated for us because the players are not in top shape because they arrived late after the World Cup.
“That’s why it’s important that we win our match, but today it was very difficult.”
Guingamp boss Antoine Kombouare said: “There are two disappointments. The first is the first half where we can return to the locker room with (the score) 2-0.
“Afterwards, it’s up to the referee and we saw that it was against us.
“And the second disappointment is to have taken (conceded) the goal too early.
“That they scored very quickly (after half-time), it gave us a blow on the head.
“And after, what we can see is that we had given a lot in the first half, we left a lot of strength, and in the second half with their mastery, offensively it hurt us very much and they could do what it takes to score three goals.”
Defending champions PSG lead the table with six points from two games. Guingamp have suffered two defeats so far.
Brazil head coach Tite has mounted a defence of superstar forward Neymar’s behaviour.
Neymar, 26, was criticised during World Cup 2018 for his perceived playacting and other antics.
This has sparked a reaction from his international coach.
Watch his press conference below.
The 19-year-old forward was rested for last weekend’s opening-day win over Caen following his World Cup exertions.
Mbappe was named the best young player at the tournament after scoring in the final as France beat Croatia 4-2.
PSG coach Thomas Tuchel confirmed Mbappe is in contention to feature and is expecting even bigger things from the youngster in Ligue 1 this term.
“He has just returned from winning the World Cup, so now he has a lot more experience,” Tuchel said.
“I expect him to continue his progression this season. We have to make sure he stays hungry for winning, that he stays focused on his football and keeps his head on his shoulders, that he keeps growing, despite everything he has already won.
“He is a real competitor, he wanted to play last Sunday but I wanted to wait a little. We will see after training if he is ready to play against Guingamp.”
PSG will still be without Layvin Kurzawa, Edinson Cavani and Marco Verratti for the clash.
But German midfielder Thilo Kehrer could be added to the squad following his £33million transfer from Schalke.
“With Thilo, we have signed a very versatile player, capable of playing every position in midfield and also in midfield in front of the defence,” added Tuchel, according to psg.fr.
“Our aim is to improve the squad and keep it as competitive as possible. If we need other players to reach our objectives, we will look for them.
“Thilo is a very talented player, very strong and technical. We have to see how quickly he can adapt. He trained for the first time on Thursday and the next session will be more intense. We will decide if he travels with us to Guingamp.”
Guingamp will be looking to bounce back from their opening-day 2-1 defeat by St Etienne.
Head coach Antoine Kombouare said keeping the ball would be key to resisting the likes of Neymar and Mbappe.
“Because if we can’t we’ll be constantly having to defend and chase after the ball, it’s very difficult,” he said.
Neymar made his PSG debut in the corresponding fixture at the start of last season, inspiring the capital side to a 3-0 victory.
Kombouare added: “We’d love to play a great match. The 3-0 defeat last year has stayed in our minds. We played a great match but Neymar and the other Parisian players were on top form that night.
“When they’re like that, it’s difficult to stop them.”