Indian batsmen failed miserably against New Zealand's spin bowling in the World T20 opening match. India's 47-run loss to New Zealand in the World T20 opener in Nagpur on Wednesday makes Mahendra Singh Dhoni's men a vulnerable lot, ahead of the big Pakistan clash, according to Sunil Gavaskar.

The former India captain said the game against the arch-rivals has now become a must-win one for the hosts, if they are to qualify for the semi-finals.

"I think overconfidence led to the downfall of India. If they have not been able to beat New Zealand, they might struggle against Pakistan too," Gavaskar told NDTV.

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