New Delhi, Sept. 16 -- Al Nassr's return to Asia's top club competition ended in a heavy 4-0 loss to UAE champions Al Ain at Hazza bin Zayed Stadium on Tuesday. Cristiano Ronaldo was kept quiet as the Rahimi brothers and Giorgos Giakoumakis tore through Ange Postecoglou's star-filled side on Matchday 1 of the AFC Champions League Elite.

Houssine Rahimi scored twice. Older brother Soufiane added the third. Substitute Giakoumakis finished the job late.

Al Ain needed only one defensive lapse to go in front. In the 25th minute, Saad Al Nasser played a back pass toward goalkeeper Nawaf Al Aqidi. Houssine read it, took the ball into the box and slotted it through the keeper's legs.

The hosts had already hit the post early through Houssine. R...