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Noufal P N scored a brace as the Malabarians crushed TRAU FC 6-1.
The triumph also promoted them to the top-tier Indian Super League.
Sergio Barbosa da Silva scored both the goals for Delhi in the second half.
Mohammedan SC, who beat NEROCA 2-0 in an earlier kick-off at Shillong, lead the table with 47 points from 20 games.
Matija Babovic scored a brace as Gokulam won 4-3 in Kozhikode.
The loss has almost dashed the Malabarians' title hopes.
Mohammedan Sporting Club rallied to hold Sreenidi Deccan 1-1 in another match to stay top of the table.
Gokulam won 2-1 with goals from Alex Sanchez and Abhijith K.
Alex sanchez converted a penalty to draw level, while Lalliansanga Renthlei struck in the third minute of added time as Gokulam extended their winning streak to five games.
The Malabarians outplayed Rajasthan United 4-1.
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