Cristiano Ronaldo scored the later winner as Manchester United came from two goals down to win 3-2 at Old Trafford against resilient Atalanta.
The visitors took the lead Mario Pasalic before Merih Demiral doubled their lead seconds to the half hour mark.
Unfortunately, poor defending in the second half gifted a wasteful Manchester United the opportunities with Marcus Rashford pulling one back home in the 53rd minute.
Manchester United captain Harry Maguire poked home on a lose ball to draw them level in the 75th minute before Ronaldo sealed the winner and completed the come back in the 80th minutes.
The result now see Manchester United jump to the top of their group with six points from three matches.