The win took the Kolkata side level to 16 points from seven matches, the same as Mumbai City FC. Bengaluru stayed third with 12 points.
David Williams' 33rd-minute strike proved the difference as ATK Mohun Bagan got the better of Bengaluru FC in the Indian Super League (ISL) at the Fatorda Stadium on Monday.
The Australian scored his first goal of the campaign with a stunner which was enough to inflict on Bengaluru, their first defeat of the season.
The win took the Kolkata side level to 16 points from seven matches, the same as Mumbai City FC. Bengaluru stayed third with 12 points.
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