The Portuguese star, without a goal in his past three appearances for the Saudi Arabian side, netted the second of the hosts' goals at Al Awwal Park in Riyadh.
Cristiano Ronaldo missed a stoppage-time penalty and his Saudi Pro League club Al Nassr were eliminated from the King’s Cup in a 1-0 loss to Al Taawoun.
Ronaldo stepped up to take the penalty and the 39-year-old sent the goalkeeper the wrong way to score his sixth goal of the league campaign in the seventh minute of stoppage time.
Cristiano Ronaldo insists he is focused on being the perfect team member at Saudi side Al Nassr rather than collecting more individual accolades in the twilight of his career.
Ronaldo, making his first appearance in the rebranded Asian Champions League having missed last week's 1-1 opening draw against Iraqi club Al Shorta, had a goal disallowed for a narrow offside at the beginning of the second half.
His Portuguese predecessor Castro was the third coach to depart Al Nassr since Ronaldo's groundbreaking arrival in early 2023.
Al Nassr captain Ronaldo did not travel with the squad for the match in Baghdad, with the club issuing a statement a day before stating that the Portuguese superstar had been diagnosed with a viral infection.
The Portuguese veteran is targeting Asia's top club crown to add to his long list of achievements when the competition kicks off on Monday.
Honouring Cristiano Ronaldo's achievement of being the first and only player to reach the incredible milestone of 900 career goals, Al Nassr presented the Portuguese forward with a special jersey ahead of their Saudi Pro League game against Al Ahli on Friday.
Saudi Pro League champions Al-Hilal battled past Cristiano Ronaldo's Al-Nassr 5-4 in a penalty shootout on Friday to win the Saudi Cup and claim the domestic double, leaving the Portuguese forward in tears at the end of the drama.
The Portuguese 39-year-old scored a brace in his side's 4-2 win over Al Ittihad on the final matchday to bring his league tally this season to 35 goals.
Al Hilal, who lost Neymar Junior to injury in October, beat bottom-placed Al Hazm 4-1 to go an unbeatable 12 points clear of Ronaldo's Al Nassr with three matches remaining.
Ronaldo was once again the star performer for his side and was as clinical as ever in front of the goal. The 39-year-old was too hot to handle for the Al-Wehda players who completed the 66th hat-trick of his illustrious career.
Superstar Cristiano Ronaldo ended a two-game goal drought as he scored a brace to help his Saudi Pro League side Al Nassr to a 3-1 win Al Khaleej in the semifinal of the King’s Cup of Champions on Wednesday.
Portugal's record scorer was shown a straight red card four minutes from time for elbowing an opponent when his side were 2-0 down before they scored a late consolation.
The 39-year-old scored back-to-back hattricks in three days.
Al Nassr striker Cristiano Ronaldo has once again silenced his critics after grabbing a hat-trick. The 39-year-old scored three second half goals against Al Tai to bring up 33 goals in all competitions this season for the Saudi outfit.
Cristiano Ronaldo, who had just recently become the first footballer to achieve 800 career wins, was included in the Portugal squad for the upcoming friendly matches against Sweden and Slovenia.
The 39-year-old Portuguese was the only Al Nassr player to score in the shootout as his Saudi side went out 3-1 on penalties, the tie having ended 4-4 on aggregate.