The forward scored in the second compensated minute by the first half.
The 36-year-old player finished off the ball after Freddie Woodman's save.
Thus, he distinguished himself in the first match after returning to the camp of the Mancunians.
Ronaldo joined United in August 2021 from Juventus Turin, for which he has played since 2018.
The contract with the "red devils" was signed for two years with the possibility of extension for one more.
Recall that he left the Portuguese Manchester United in 2009.
Then he moved to Real Madrid.
Earlier it was reported that Ronaldo entered the field wearing a Manchester United shirt 12 years later.