The 28-year-old, who is playing his rookie season after coming through the Web.Com Tour Finals, carded an eight-under 64 to share the lead with Jason Dufner, Jerry Kelly and Jeff Overton.
Two others, Colt Knost and Jamie Lovemark were at 65 and another 11 players shot 66 each.
Playing on a sunny morning with very slight wind, two- time winner on European Tour last year, Lahiri did not miss a single green on Thursday.
"I'm really happy with the way I started today. I was a bit unsure of how I was going to go today. Obviously still feeling all the travel from coming from Asia last week. But really happy with the way I hit the ball. I don't think I missed a green all day. I felt really good out there," said the World No. 41.
Lahiri flew in straight from Malaysia, where he won his final singles against Shane Lowry at the EurAsia Cup.
Playing his first event on PGA Tour since the Hero World Challenge in Bahamas, Lahiri speaking of his off-season, added, "Well, I got a lot of rest, to start. I was playing three different tours last year and I was absolutely ragged by the end of the year.
On the other two courses, that he plays on next two days, Lahiri said, "Yes, I played the Stadium Course, I went and mapped out the Nicklaus Tournament Course. I got in on Monday afternoon, so I don't think it was a good idea for me to play 54 before I teed up. So we'll find out (about the other courses). They look pretty good. They're similar, if you put yourself in a good position, there's a few wedges and a few birdies to be made. "
Bill Haas, the defending champion carded 66 while Phil Mickelson, two-time winner at Career Builder, shot 68.
The 45-year-old Mickelson in his first start since The Presidents Cup in October, played a seven-hole stretch in 6- under during his 68. He three-putted on par-5 13th and made two late bogeys.
Winless since the 2013 British Open, this round was also Mickelson's first since splitting with swing coach Butch Harmon to work with Andrew Getson.
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