Lahiri, one of the three Indians in the field, started with a birdie on first and then birdied the fifth and added a third one on par-3 eighth.
Then came the par-5 ninth, which he eagled to get to five-under and two ahead of Austrian Bernd Wiesberger and local man Victor Dubuisson, who shot 68 each.
Jeev Milkha Singh struggled to a five-over 76 that included an eight on par-four eighth hole besides bogeys on13th and 18th. Shiv Kapur was even through seven holes with one birdie and one bogey.
But the weather has been surprisingly hot, much like a Delhi summer. The course is in great shape and it has a beautiful stadium design with natural Grandstands.
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He also added,"My game is feeling better and better surfaces this week should lead to a better week on the greens."
Play was suspended just moments before it was due to get under way at 0730 local time at the 2018 Ryder Cup venue, although the initial delay lasted just 30 minutes.
Germany's Martin Kaymer, who missed the cut in the defence of his US Open title at Chambers Bay, carded 69.