Later, former champions Air India struck good form and soared to a 5-3 victory against Northern Railway in another Pool A all-Delhi game for their second win on the trot at the MHAL-Mahindra Stadium.
ONGC scored their first goal against Union Bank through Pramod Kumar in the 19th minute. But the younger Union Bank outfit made a strong reply and restored parity through Kiran Thokcham's field goal in the 25th minute and the teams went into the break level at 1-1.
Union Bank continued to fight gamely and reduced the deficit when Irshad Mirza found the net in the 68th minute.
In the Air India-Northern Railway contest, the railmen took an early lead through Manpreet Singh in the 23rd minute.
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But Olympian Arjun Halappa scored two goals, on either side of the break, to put AI in the lead.
In between those goals, Northern Railway scored twice through Sukhman Singh (49th minute) and Harsahib Singh (68th minute) to cut the margin of defeat.