With almost the first touch of the match, the Portuguese striker returned home an impressive ball from his international teammate Bruno Fernandes to open his account in this season’s competition, with the strike coming 12 years and 132 days later of his last goal in the Champions League.
Now Ronaldo has 135 goals in competition, 15 ahead of Lionel Messi in second place.
It had already been a full afternoon for Ronaldo in the Swiss capital of Bern after a warm-up during the pre-match warm-up hit a security guard who was near the stands.
Ronaldo quickly jumped over the billboards to go check the guard, who was being attended to by other members of the stadium.
On the pitch, things got a little more complicated for United later in the first half after defender Aaron Wan-Bissaka received a direct red card for a clumsy lunge to Christopher Martins.
Young Boys started the second half at the front foot and the extra man advantage soon began to show, as United were forced to defend wave after attack from yellow and black shirts.
The home side worked hard to get through the middle and as a result, had a good chance of getting one back as tried lifting the ball over keeper Nicolas Ngamaleu. Unfortunately, the ball went just over the bar.
However, despite dominating for the rest of the match, it took Young Boys until the end of the play to find a winner in front of a stark crowd.
A pass to the side pulled the defense out of position which let Theoson Jordan Siebatcheu slip through on goal. He didn’t have to break his stride, slipping the ball past the keeper.
Crowds inside Wankdorf Stadium erupted and celebrations of historic victory are likely to continue well into the night.