World No 40 Lahiri, buoyed by his qualification to the International Team for the President's Cup was three-under 14 holes and in tied seventh place.
Lahiri, one of the morning starters at the Sycamore Hills Golf Club, which is hosting the first event in a series of four to determine the final 25 cards for the 2016 PGA Tour schedule, had five birdies against two bogeys.
He was three shots behind the leader Ricky Barnes, who was six-under through 16 holes and he was closely followed by Brian Davis and Brice Garnett, who were both five-under through 15 holes.
Further birdies on fifth and eighth and a bogey in between on par-3 seventh meant he turned in two-under. His fifth birdie on the day on par-3 11th brought him to three-under.
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Lahiri's second bogey was also the result of a three-putt on the par-3 seventh. After picking birdies on both par-5s on front nine on second and fifth, he managed only a par on the par-5 after getting into the primary rough off the tee.
That also means he will need to make enough money to stay in Top-25 to make the card, while others are likely to play all four events including the Tour Championships.
Lahiri, when asked if that made it more difficult for him, said,"No, obviously, actually it actually makes it simpler for me. It makes it clear for me. Obviously, I'm here. I'm going to try and go for the win or get into a position where I can close it out without having to go to the fourth event.
"In terms of playing new courses, I think of every event that I've played this year in America and Europe every single one of them has been pretty much on a new course. So it's something that I've kind of gotten over mentally about whether I'm comfortable or not. I just get there and I treat it like every other event."
"In my mind, I believe I'm going to get my card in three events. So hopefully I can play my A-game and get it done." Lahiri, who has travelled back and forth from Asia to Europe and US and back more than a few times this season, added,