Nobody was expecting that scoreline.
Ronaldo's outstanding volley put the Serie A champions 1-0 ahead against United in Turin.
But United are no slouches in Turin.
Outside of one draw, Juventus have won every game they have played this season.
"The game is always 90 minutes, we're pushing, maybe have an extra bit of power at the end, we push it and score".
Ronaldo was once again the main dangerman, and tried his luck from the edge of the penalty area, but his strike came off Chris Smalling's face and went out for a corner.
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"Juventus have phenomenal players", he added. There was more of a thread between United's attacking players against Juve than there is when Lukaku plays. United had faced the likely and awkward prospect of going to Valencia for their final group game next month and needing either to avoid defeat or win. They looked comfortable on the ball, with Luke Shaw and Ashley Young often staying behind the play in the first half, but they did not really have a shot on goal.
There has been more confidence and attacking intent about the team in recent weeks, looking at their best when their backs are to the wall and when they are underdogs with the vultures circling. "Hopefully we can get all three points".
It is a big ask for United to stop them, and they will have to play much better than they did against Juve to stand a chance.
Juventus, on the other hand, looked unsafe every time they went forward thanks to the link-up play between Cristiano Ronaldo and Paulo Dybala.
"I didn't realise it was a fantastic goal until I saw the replay", he said.
Pogba didn't excel, but he was well received at his former club on his return to Italy.
Back in 1999, United's 3-2 semi-final comeback against the same opposition reminded the world never to write them off on their way to the Nou Camp. Although the Portuguese admitted that he probably should not have done that, most United fans were delighted that he did.
Statement wins away from home in the Champions League have been in short supply since Sir Alex Ferguson retired five years ago, but this was one. It was one of those nights.