With his 701st career goal,Ronaldo marked his return to the Manchester United fold and helped his team to a comfortable victory.
After being dropped for last weekend's trip to Chelsea for refusing to come on as a substitute against Spurs eight days before, it seemed as though he was destined not to score.
The great got his head to the cross with nine minutes left. Sheriff keeper Maxym Koval made a low save but as the ball spilled loose,Ronaldo pounced to complete United's biggest win of the season.
The five-time Ballon D'Or winner had a rough week.
In order to top the group and avoid a play-off, United will have to avenge their defeat on match day one against Real Sociedad in Spain next week.
A minute before the break, Diogo Dalot headed in Christian Eriksen's corner to give the hosts a 2-0 lead.
MarcusRashford headed home Shaw's cross midway through the second period.
It's difficult to gauge any negative reaction toRonaldo because it sounds like booing.
When the Portuguese's name was read out just before kick-off, there was a noise that wasn't supportive cheering, but the best that could be said was that the reaction was mixed.
The truth is that the 37 year old has struggled this season.
He had the best chance of the first half when Bruno Fernandes headed him the ball. The bottom corner would have been the location of the stabbed finish. It went to the goalie.
At the start of the second half, there was an audible gasp of expectation as he stepped to his left to shoot from the edge of the area.
The net was going to bulge. The shot flew wide to the amazement of the man. He did find the net with a volley, but he was ruled out for being in an ineligible position. There was a supportive chant rolling around the ground.
The turning point was near the stadium. Even though the game was won, the jubilation was still present. The noise that came from the tunnel as he made his way to the dressing rooms was very positive.
It has been almost 20 years since the first person to bring Old Manchester to its feet.
The next 18-year-old is going to begin the process of becoming a world class performer.
The family of Alejandro Garnacho were in the directors box when he came out for the warm-up.
As the game went on, Garnacho grew more confident.
He tried to set upRonaldo in the first half, then cut in from the left flank and tackled Renan Guedes, who was booked.
If Garnacho can reach the standard of Ten Hag, it would save United a lot of money since they have spent a lot of money on other players.
The teenager was given a standing ovation when he was replaced by Van de Beek.
There was no chance of Old United reacting to Antony's departure.
In one of his showboating exhibitions, the Brazilian provided the most memorable moment when he did a double spin with the ball at his feet.