Mauricio Pochettino lost his second game as Paris Saint-Germain manager after the defending Ligue 1 champions succumbed to a 2-0 home defeat to AS Monaco on Sunday.Sofiane Diop and Guillermo Maripan were on target for Monaco, who became the first team since AS Nancy in the 2011/12 season to complete a domestic double over Paris Saint-Germain.The hosts, who thrashed Barcelona in the UEFA Champions League in midweek, appeared to be exhausted and turned in a flat performance.Tuesday: Thrash Barca 4-1 at the Camp NouSunday: Lose 2-0 at home to MonacoPSG are third in Ligue 1 🙃 pic.twitter.com/1P75BMBI1x— B/R Football (@brfootball) February 21, 2021The defeat was Paris Saint-Germain's sixth of the season, their most in a single league campaign in nine years. They now trail runaway leaders Lille by four points.Here are five hits and flops from Paris:Flop: Kylian Mbappe (Paris Saint-Germain)Kylian Mbappe was below his best for Paris Saint-Germain against MonacoHaving put up an inspired performance against Barcelona on Tuesday, netting a brilliant hat-trick at the Camp Nou, Kylian Mbappe seemed to have run out of gas against Monaco.The 22-year-old forward's magic was nowhere to be seen as he was completely overpowered by Monaco's stoic defense, who kept him firmly under wraps.7 - Since he joined Paris during the summer of 2017, Kylian Mbappé has scored seven goals against Monaco in Ligue 1 - he has only found the net more often against Dijon (9) in the top-flight during that period. He has scored PSG’s last three goals against ASM in Ligue 1. Prince. pic.twitter.com/ROwDQL7iNZ— OptaJean (@OptaJean) February 21, 2021Failing to muster even a single effort at goal, Mbappe was dispossessed four times on the night, the most alongside Moise Kean, and completed only three of his seven attempted dribbles.The Frenchman boasts a terrific record against his former employers but tonight was arguably one of his worst-ever performances for Paris Saint-Germain.Hit: Aurelien Tchouameni (AS Monaco)Aurelien Tchouameni showed why he's wanted by the likes of Chelsea and Real MadridAurelien Tchouameni ran the show for Monaco, making his impact at both ends of the field as the visitors never ceded control of the match.Aurélien Tchouaméni vs PSG21 passes81% pass accuracy2/2 accurate long balls1 successful dribble8 tackles won5 interceptions1 clearance1 blocked shot10/15 duels won21 years of age. Gigantic performance. One of Ligue 1's best midfielders this season. 🔴⚪️ pic.twitter.com/2J6RvRkPrq— Football Talent Scout - Jacek Kulig (@FTalentScout) February 21, 2021The 21-year-old was the key to breaking PSG's attack. He made several blocks and interceptions while spraying passes forward to Monaco's attackers.The former Bordeaux midfielder has made a huge impact for Monaco in his first full season with the club, and tonight was another reminder of his seamless potential.