Manchester United once again beat Paris Saint-Germain at the Parc de Princes to secure all three points in their UEFA Champions League opener.Anthony Martial's own goal cancelled Bruno Fernandes' first-half penalty, and just when it seemed like the tie would end in a draw, Marcus Rashford smashed the Parisians' hopes with a stunning effort in the dying embers.This was a second consecutive win in Paris for the Red Devils after last year's 3-1 victory in the second leg of the Round of 16 as the French champions, also last season's runners-up, put in a disappointing performance.Here are the hits and flops from the match:Hit: David De Gea (Manchester United)David de Gea had a stormer between the sticks for Manchester UnitedAfter a very long time, beleaguered Manchester United shot-stopper David de Gea finally put in a great performance and made several important saves for his side.The Spaniard was in an inspired form on Tuesday night. He made five saves against PSG, including a point-blank stop to deny Laywin Kurzawa and a solid catch to thwart Neymar's venomous effort from outside of the box. We've said it before and we'll say it again: @D_DeGea is tonight's Man of the Match! 🤩#MUFC #UCL pic.twitter.com/ibeHenQvvS— Manchester United (@ManUtd) October 20, 2020This stellar performance will do a world of good for the goalkeeper, who has become highly erroneous and who has drawn plenty of flak for laughable blunders recently.Also check out: Complete Champions League Schedule 2020/21Flop: Kylian Mbappe (PSG)Not the best day in the office for Kylian MbappeEven the best players have their bad days, and today was one such day for Kylian Mbappe.The 21-year-old was smothered by Aaron Wan-Bissaka throughout the game and misplaced plenty of passes. He even tried to switch flanks towards the end but that didn't help his cause either.Since the start of the 2018/19 season, Kylian Mbappe has scored two Champions League goals at Parc des Princes.So has Marcus Rashford 😳 pic.twitter.com/BCAnfp4z1T— Football on BT Sport (@btsportfootball) October 20, 2020Despite managing five shots, Mbappe didn't prove decisive enough for his side. It was a rare night of disappointment from the youngster.