Naft Tehran scored three goals in the second half to earn the Iranian side a 3-0 victory away to Al Shabab in their AFC Champions League Group B match on Tuesday.
Vahid Amiri, Amir Motahhari and Reza Aliyari all scored in the final half an hour to secure all tree points for the visitors, who now lie on top of the group with just two matches left.
With both sides needing a victory to remain in contention for a knock-out place, the first half produced few goal-scoring opportunities at either end.
Amiri eventually broke the deadlock in the 57th minute when he received a pass from Mehdi Shiri, before playing a neat one-two with Kamal Kamyabinia which afforded him the space to slot his left-footed effort past goalkeeper Mohammed Al Owais.
Caio Junior's side were unable to breach the resolute Naft defense even though they had a decent amount of ball possession, and in the 83rd minute, the Iranian side doubled their advantage.
The 22-year-old Motahhari took advantage of a defensive error from Tareq Khattab to find himself in space just outside the box and unleashed a powerful shot that found the back of the net despite Al Owais' best efforts.
With the match as a contest over, Naft added insult to injury in stoppage time when Iman Mobali's corner kick was headed in by Aliyari.
After Tuesday's match, Naft are on seven points, one ahead of Al Ain with Pakhtator another point behind in third.
Caio's outfit are on the verge of elimination with just two points from four matches.