The five-time Ballon d'Or winner was booked and substituted for the first time since moving to Saudi Arabia - and his frustration was clear.
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With Al Nassr two-goals up and Ronaldo set to launch a counter-attack, the 38-year-old reacted furiously when the referee blew the half-time whistle.
He booted the ball away, resulting in a yellow card, and it was not the first time Ronaldo has thrown a tantrum in the Middle East.
The Portugal sensation was seen ripping his captain's armband off and lashing out at water bottles on the touchline after the 1-0 defeat to title rivals Al Ittihad last week.
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And it all comes amid a mini-goal drought for Ronaldo, by his standards, anyway.
Ronaldo has not scored in his last three matches and he is yet to open his account at Al Nassr's home Mrsool Park.
The ex-Manchester United forward still has eight goals in as many games for his new club, including two hat-tricks.
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However, with those goals coming in big spurts, he has blanked in more games than he has scored.
Ronaldo took to social media after the games, posting: "Good victory team! We move on to the semi-finals!"
And his manager Rudi Garcia offered a possible explanation for his recent struggles in front of goal.
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"Ronaldo's presence gives the opposing teams an incentive to play the game of their lives against him," local media quoted Garcia as saying after the game.