Never in doubt!
In truth, United could and should have been out of sight by half-time having fallen 0-2 behind but missed a hatful of chances. Marcus Rashford pulled a goal back before captain Harry Maguire levelled to set the stage for that man Ronaldo to send Old Trafford wild.
Here is how we rated each Red on a heart-stopping night in M16. Viva Ronaldo!
David de Gea - 7
Had relatively little to do and wasn't to blame for either goal. His magnificent double save at 1-2 surely kept us in the tie. If either go in, it's game over. How pivotal it proved to be
Aaron Wan - Bissaka - 7
Contributed little at either end but seemed to get better as the tie went on. Surged forward superbly in the second half onslaught.
Harry Maguire - 6
Showed leadership and courage in the second half and popped up with a captain's goal to level. Could have perhaps done more to prevent the Mario Pasalic opener.
Victor Lindelof - 5
Looked very much like the third choice centre-back he now is. Got bullied by Luis Muriel and was spun too often. A below par showing from the Swede.
Luke Shaw - 7
Caught out on the corner for the second goal but redeemed himself with a worldie of a cross for Ronaldo's coup de grace.
Scott McTominay - 5
Thumped the post at 1-2 but couldn't get near Pasalic and was hooked after an hour as United looked to chase the game.
Fred - 6
Played with his usual insatiable energy, tested Juan Musso and should have scored just before half-time. His passing was typically sloppy but actually had one of his better games
Mason Greenwood - 5
Pressed high and well early on but faded to the fringes even as the Reds took the upper hand. The 20-year-old has been our best player this season but struggled here.
Bruno Fernandes - 7
Poor in the first half but, like so many, came alive after the interval. Set up Rashford with a filthy assist to start the revival and put the cross in for his captain to equalise. Even when not at his best, his impact is seminal
Marcus Rashford - 6
Looked lively and back to full fitness but squandered two good chances and struck the bar when he should have scored. Came off with a knock after a nice finish
Cristiano Ronaldo - 8
Created chances for Fred and Rashford and should have scored himself before he was there to meet Shaw's cross. A player made for nights like this. Viva Ronaldo! Siuuuuu
Edinson Cavani (for Rashford 66) - 6
Relentless work rate, ran his nuts off and might claim an assist for Maguire as he got a flick on Fernandes' cross
Paul Pogba (for McTominay 66) - 8
Magnificent when he came on. Carried the ball, pressed, linked superbly, broke the lines and pushed Atalanta back.
Jadon Sancho (for Greenwood 73) - 6
Showed glimpses again with some darting runs in behind.
Nemanja Matic (for Fred 88) - N/A
Brought on to sit in midfield and see the game out. No rating.