Parrish Petty led Gorgan with 26 points at the Azadi Basketball Hall in Tehran, while Wael Arakji scored 16 points for Al Riyadi.
Gorgan moved top of Group B with seven points, one point above Al Riyadi.
Shahrdari Gorgan is in Group B along with Al Naft SC of Iraq, Al Karamah SC of Syria, and Al Riyadi Beirut of Lebanon.
Zob Ahan, another Iranian representative, are in Group A along with Ittihad Ahli, Beirut Club and Orthodox Amman.