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In the match held at Tehran Azadi stadium on Tuesday, Nawaf Al-Abid scored the only goal of the guests 11 minutes before half-time.
In another match of the same group, Qatars Al-Rayyan snatched a 2-1 win over Al-Ain of the UAE on Tuesday.
After four rounds of matches, Irans Esteghlal remained at the top of Group D with seven points, one ahead of Al-Ain, Al-Hilal and Al-Rayyan.
All four teams remain hopeful in the hunt for a place in the last 16 of the AFC Champions League from Group D.
By Xinhua
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