This triple means that Ronaldo became the first man to score three goals in one match for the tenth time in his international career, and raised his score to 115 goals in 182 international matches, to continue to strengthen his top scorer list.
Portugal retained second place in the group, one point behind leaders Serbia, who have 17 points, after their 3-1 victory over Azerbaijan today, but Ronaldo’s comrades have a game in hand, as well as a large difference in goals.
Portugal won the match early in the first 18 minutes.
Ronaldo scored two goals from the penalty mark before his Manchester United colleague Bruno Fernandes added the third goal with a shot from close range after a pass from Bernardo Silva.
Ronaldo missed two dangerous chances before and after the break to score his third personal goal, then Luxembourg goalkeeper Anthony Morris saved a superb back shot from the Portuguese top scorer.