The Portuguese star, who had featured only in the first half of the midweek AFC Champions League fixture, made an immediate impact in the Saudi Pro League, scoring both of Al-Nassr's opening goals before the break.
His first was a textbook striker's finish. Showing classic No.9 instincts, Ronaldo reacted quickest at the near post to turn home a flick-on from Al-Amri following a corner, finishing from virtually on the goal line.
Just before half-time, he doubled his tally. Timing his run perfectly, he attacked a precise delivery from Marcelo Brozovic and powered a close-range header beyond the goalkeeper to make it 2-0.
Another brace, another step closer to football immortality. At 40, Cristiano Ronaldo shows no sign of slowing down as the countdown to 1,000 continues.