ATK Mohun Bagan snook past today's visitors Chennaiyin in a closely fought clash. It took David Williams 90th minute header to finally break down Csaba Laszlo's force that was his defensive structure.

David Williams 90th minute winner enough to seal all three points for the Mariners to keep pace with Mumbai City FC at the top and moved to within two points of the league leaders. Chennaiyin will be left disappointed after having many chances of their own.