In their opening game against Spain, it was Ronaldo's hat-trick that earned them an incredible 3-3 draw.
Renard was involved in discussions with officials over two rejected first-half penalty claims but his side created enough chances to score from open play had they been more accurate in front of goal.
The much-talked about plan of a Portugal in possession, spreading the play and dictating the tempo never materialised.
Portugal will meet Iran in their final group game on June 25, with Morocco set to bow out after their match against Spain in Kaliningrad.
Morocco got the match underway in what turned out to be a crackerjack at the end.
Ronaldo took his tournament tally to 4 goals when he charged into the box, timing his run to perfection in the fourth minute to power in his header.
This is a live blog for the Fifa World Cup 2018 which is updated round the clock.
Noureddine Arabat and Hakim Ziyach were particularly impressive as Morocco targeted Portugal down the flanks.
Russian fans were elated as the World Cup hosts cruised past Egypt 3-1 in their second game in Group A, virtually booking a place in the knockout stages of the tournament.
"It is a privilege for us to have Ronaldo in our team".More news: Meghan Markle Goes to the Races
Here's how to watch Morocco vs. Portugal online.
"I'm not disappointed about the performance, I'm happy with it and very proud of my players", emotional Morocco coach Herve Renard told reporters.
"If the game against Morocco was the World Cup final for us, the game against Spain will be the Universe Cup final", said the former Real Madrid coach. You can stream the match online on fuboTV (Try for free).
Meanwhile, Portugal were just trying to waste time.
The captain also put through Goncalo Guedes before the break only for the forward to shoot directly at Monir El Kajoui.
Morocco, who had several opportunities to score at the Luzhniki Stadium but failed to convert their chances, have no points, having also lost 1-0 to Iran, and can not progress to the second round.
Daei scored 109 goals for Iran in a 13-year worldwide career between 1993 and 2006.
There is history between these teams, as well as Ronaldo and Morocco center back Mehdi Benatia.
The win in a cagey affair at Moscow's Luzhniki Stadium, filled to its 78,011 capacity on a partly cloudy afternoon, lifted Portugal to four points in Group B although they were far less impressive than against Spain.