Abahani handed holders Bashundhara Kings a 1-0 defeat in the Bangladesh Premier League at Shaheed Dhirendranath Dutta Stadium in Comilla Friday.
Sumon Reza headed home the all-important goal with only three minutes into the clock.
The Sky Blues then held their fort till the rest of the game to emerge with all three points.
Mohammedan, in the day's other match, defeated Police 3-1 at Rafique Uddin Bhuiyan Stadium in Mymensingh.
Tony, Sunday and Souleymane Diabate netted one each for the Black and Whites while Al-Amin scored the consolation goal for Police.
Mohammedan maintained solo lead at the top of the table while Abahani sit second three points behind the leaders.
