Portugal's forward Cristiano Ronaldo gestures after opening the scoring for Portugal during the Russia 2018 World Cup Group B football match between Portugal and Morocco at the Luzhniki Stadium in Moscow on June 20, 2018. / AFP PHOTO / Francisco LEONG / RESTRICTED TO EDITORIAL USE - NO MOBILE PUSH ALERTS/DOWNLOADS “He’s constantly evolving. Unlike regular players, he’s always evolving.”

MOSCOW, Russia — Portugal coach Fernando Santos compared Cristiano Ronaldo to a bottle of port, the fortified wine that famously gets better with age, after his latest match-winning goal for his country.

Five days after his hat-trick rescued Portugal in an opening 3-3 draw against Spain, Ronaldo’s fourth-minute header clinched a 1-0 victory over Group B opponents Morocco in Moscow.

Three previous tournaments yielded a return of just three goals for the five-time world player of the year, but Ronaldo is taking Russia by storm after netting four times in two matches.

“Cristiano Ronaldo is like a port wine, he changes as he ages,” said Santos. “He’s constantly evolving, unlike regular players he’s always evolving.

“He won’t be doing the same thing in two or three years and he’s not doing what he did four or five years ago. He knows himself well and knows what he needs to do.”

Ronaldo bagged a staggering 15 goals in European World Cup qualifying as Portugal reeled off nine consecutive wins to seal a fifth consecutive appearance.

It is likely to be a fourth and final World Cup for the 33-year-old, although he is showing little sign of decline after a fourth Champions League title in five seasons with Real Madrid.

Portugal reached the semi-finals in 2006, losing to a Zinedine Zidane penalty against France, but exited in the last 16 four years later before crashing out at the group stage in Brazil.