Mohun Bagan scored through Sony Norde, Jeje Lalpekhlua and Glen Cornell in their Group G 'home' leg match at the Indira Gandhi Athletics Stadium.
Norde struck the opening goal for Mohun Bagan when he sent his powerful freekick into the back of the net in the 19th minute.
The Kolkata giants, having failed to make the grade at the top tier Asian Champions League, scored their second goal through a Jeje Lalpekhlua strike in the 33rd minute.
After the change of ends, luck smiled on Maziya as Imaaz Ahmed reduced the margin with a tap-in.
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However, Mohun Bagan continued their good run of form with another goal, again through Jeje in the 69th minute. Barely three minutes later, Cornell, too, once again joined in the party, scoring the team's fifth and his second goal.
Courtesy an own goal by Raju Gaikwad in the 77th minute, Maziya reduced the margin.