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The Fijian met the corner kick by Ahmed Jahouh with utmost precision and slotted it into the net from close range.
Bengaluru advanced to the semifinals as group toppers with five points.
ATK Bagan thus consolidated their position at the top further with 39 points from 18 matches.
Roy Krishna converted a penalty in the 85th minute to ensure Antonio Habas' side climbed back to second spot
Kolkata heavyweights ATK and Mohun Bagan who came together to become a new identity - ATK Mohun Bagan - will be playing their first ISL season as defending champions.
The win lifted ATK Bagan to the top of the table with six points from two games, while East Bengal suffered defeat on their debut in the premier event.
Results 1-6