Relegated side ONGC opened its campaign in the I-League second division with a 5-0 win over Aizawl FC of Mizoram in Siliguri on Monday.
In the other match, United Sikkim FC edged past Vasco SC of Goa by the odd goal in five.
Abubaker, Sachin Gawas, Jathin Bisht, Parminder Singh and Andrea scored for ONGC.