A stoppage-time penalty from Kaveh Rezaei gave Iranian hosts Esteghlal a 1-0 advantage over Al Ain as both sides finished the first leg of their AFC Champions League last-16 tie with 10 men.
An uneventful contest began to unravel in the 77th minute when the visitors from the UAE had Saeed Juma dismissed for a two-footed tackle on Mohsen Karimi.
Esteghlal's numerical advantage was short-lived when Farshid Esmaeili retaliated to a challenge from Al Ain winger Caio.
But Alireza Mansourian's men were able to take an advantage into the return leg after Mohammed Ahmed handled in the box when he misjudged a clearance and Rezaei sent goalkeeper Khalid Eisa the wrong way.
Highlights| Esteghlal 1-0 |May 22, 2017
Two-time runners-up Al-Ahli of Saudi Arabia played out a 1-1 draw at home to their namesakes Shabab Al-Ahli Dubai.
The away side went ahead through Khamis Esmaeel after Yasser Al-Mosailem punched poorly from a 20th-minute free-kick, although Abdulfattah Asiri latched on to Mohamed Shafy's pass to level seven minutes before half-time.
Abdulafttah Asiri equalises for with a great finish! May 22, 2017
Get the best features, fun and footballing frolics straight to your inbox every week.
Thank you for signing up to Four Four Two. You will receive a verification email shortly.
There was a problem. Please refresh the page and try again.