While PSG slumped to its fifth loss of the season, Mbappe scored but failed to catch up to Barcelona's Lionel Messi who has now won Europe's Golden shoe with 36 goals.
PSG had won the past five League Cups, however, it was bottom placed Guingamp that upset the defending champions and are 36 points behind the star-studded club.
Without Messi, Barcelona was still the better team but failed to convert its chances at San Siro stadium as they drew Inter 1-1, but have reached the knockout stage.
Monaco, which lost 2-1 to leader Paris Saint-Germain last weekend and is already out of the Champions League, was again a shadow of the team that reached the semifinals of Europe's top competition last season.
The 18-year-old striker started the game in a PSG attack also featuring Edinson Cavani and Brazil star Neymar, who joined this summer from Barcelona for a world record 222 million euros ($262 million).
Mbappe has been added to a glittering assembly of attacking talent that includes Brazil star Neymar, striker Edinson Cavani, and wingers Angel Di Maria and Julian Draxler.
With Paris Saint-Germain spending massively, French clubs paid out 697 million euros ($830 million) and made 619 million euros ($736 million).
Once PSG signed Neymar, the chances of Monaco holding onto Mbappe went down.
Monaco coach has not completely ruled out a sale, but the preference is to offer Mbappe a new and vastly improved contract so that he stays at least one more season.
Mendy's arrival on a five-year contract follows the departure earlier this summer of long-time City left-backs Gael Clichy to Turkish club Istanbul Basaksehir and Aleksandar Kolarov to Roma.
8 time Olympic gold medalist Usain Bolt held on to win the 100 meters at the Herculis track meet. Bolt is retiring after the world championships in London next month
BPL winners Chelsea have finally roped in Bakayoko from Monaco who was highly speculated on snubbing the blues to join Manchester United.
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