At a time when the game was tied 1-1, the Portuguese international appeared in the unmarked area and headed in a cross from the right side, putting his team, guided by compatriot Luís Castro, back in the 74th minute.
The opening goal belonged to the Brazilian former Benfica player Anderson Talisca, in the 40th minute, who, released in the area, shot with his left foot, putting the outsiders ahead.
In the 66th minute, Monastir equaled an unusual move: the goalkeeper made a long shot and defender Ali Al Oujami, trying to cut it, ended up deflecting the ball from his goalkeeper, putting it in his goal.
After Ronaldo returned the lead, the rout came in the final minutes, with a ‘double’ by defender Abdulelah Al Amri, consummated in the 88th and 90+1 minutes.
In the first game, in the official debut of this season, on Friday, against the also Saudi Al Shabab (0-0), Cristiano Ronaldo and Talista started on the bench, as did the reinforcements Alex Telles and Seko Fofana, however today they were part of all initial options of Portuguese coach Luís Castro.
After two rounds, Al Nassr leads with the same four points as Al Shabab, both in qualification position, while the Egyptians of Zamalek follow with three and Monastir without points.