The star of the day was Scottish striker Darryl Duffy, who in his first official match for the Mariners scored a clean second hattrick.
But the young Mohun Bagan side had to survive some anxious moment before they went ahead through a Prabir Das chip over rival goalkeeper Raju Ganguly in the 15th minute.
It stayed 1-0 at the break before Darryl Duffy completed his first Mohun Bagan hattrick in only 11 minutes. First he scored of a free kick in the 62nd minute, then a simple tap in from a pass from Prabir Das in the 66th minute and finally Duffy headed in a Prabir cross in the 73rd minute.
Young Azharuddin made it 5-0 in the 77th minute with a placed shot before Kazeem Bolanle Amobi scored the consolation goal for Aryan Club just before the finish.
MATCH STATS
Mohun Bagan AC 5-1 Aryan Club – Goals: 1-0 Prabir Das (15′), 2-0,3-0,4-0 Darryl Duffy (62′,66′,73′), 5-0 Azharuddin Mullick (77′), 5-1 Kazeem Bolanle Amobi (89′)
Mohun Bagan: Arnab Das Sharma – Sarthak Golui, Sanjay Balmuchu, Raju Eknath Gaikwad [C], Tanmoy Ghosh (Chinta Chandrashekar Rao) – Tapan Maity, Pankaj Moula, Robinson Singh, Prabir Das – Azharuddin Mullick, Darryl Duffy (Ajay Singh)
Aryan Club: Raju Ganguly – Chattu Mondal, Saurav Dasgupta, Emmanuel Ugochukwu Chigozie (Sunil), Mohan Sarkar, Asit Hazra, Pitambar Das (Abhijit), Goutam Thakur, Rajib Ghorui, Tonmoy (Kazeem Bolanle Amobi), Louis Moses Obasi
Referee: Prabir Dhar
Man of the Match: Darryl Duffy (Mohun Bagan)