In the absence of Neymar and Cavani, di Maria's performance will be of further importance to PSG on a night when he was always going to be scrutinised anyway due to his past connections with United.
Presnel Kimpembe - who was lucky to still be on the pitch after a string of fouls - scored the opening goal of the game from a corner, which was poorly defended by United. He showed no lack of desire in getting to the ball but it was noticeable that he was often being shadowed by Marquinhos whenever United were in possession, a clear sign of PSG head coach Thomas Tuchel attempting to shackle the World Cup victor.
The celebration seemed to rub the Old Trafford crowd up the wrong way, and minutes later, a beer bottle was thrown onto the pitch around where the 30-year-old was stood.
Upon seeing the object thrown at him, the Argentine picked up the bottle pretended to drink from it. Also, during an incident in the first half, Ashley Young shoved him off the pitch and he rolled into a metal barrier, but was able to continue after treatment. Let us know in the comment box below.
Eventually, it was made clear that Pogba had been shown a second yellow card for his poorly timed challenge on Dani Alves, having already been booked in the first half.
Collecting the ball wide left, Di Maria's perfectly-weighted centre left Mbappe with no option but to score after the Frenchman had burst past an unknowing United defence. He had a hard time in the first half, the guy is very competitive.
Speaking on RTE Sport, former Liverpool midfielder Didi Hamann felt the Englishman should have been sent off: "I think he should have gone". If you tease him it doesn't make him weaker, of course'. "In the end he did well".