That helped him move up from overnight four-under and T- 23rd to a healthy 12-under and sixth place after three rounds on a day, which was cloudy to begin with but became hot and sultry as it wore on.
Meanwhile, India's other challenger, SSP Chawrasia wilted under the heat and shot 74 to drop to T-60th at one-over 217.
For the second year in succession, the leader goes into the final round with a four-shot lead as Pat Perez continued with his remarkable transformation from being a journey man this time last year to a Top-30 star.
On a rather low-scoring day, when 32 players shot in 60s and 55 were under par in a field of 78, the day's best card came from Hideki Matsuyama (63), who shared the fourth spot with Keegan Bradley (65).
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Though Perez is four clear of Schauffele, the former would do well to remember that Lahiri, too, led by four and yet lost to Justin Thomas last year.
Lahiri was sole sixth at 12-under, one ahead of Ollie Schniederjans (65) and Jazz Wattananond (66) at 11-under.
Today, despite managing just one birdie from the four Par-5s, he shot 64.
On the traditional moving day, Lahiri got off to a good start with birdies on the second and fourth before adding two more on the seventh and eighth.
The Indian kept his foot on the pedal on the back nine to get to seven-under with birdies on par-3 11th, par-4 12th and Par-4 14th. He finally tamed a Par-5 after getting to the green on two on 18th to close at 64.
28 as compared to 30 and when he missed the fairways he missed them on the right places.
"I wasn't feeling very good this morning when I was warming up on the range, so I just went out there just trying to manage around the golf course. I hit a few good shots to start my round. I think I was pretty solid," Lahiri said.
"The bad shots that I hit, I think I missed it in the right places and managed to get away with it. To go bogey free is important; and after yesterday's disappointment it was important for me to try and get a little closer to give myself a run on Sunday.
For Sunday, he said, "Well, Pat (Perez) is at 21-under and I'm at 12, so I'll have to do at least what I did today or better to have a chance. But at least I'll have a chance."
The day saw a hole-in-one for Korea's Whee Kim, who aced the par-3 15th to drive away with the latest BMW car, 740Le xDrive Hybrid Vehicle with eDrive Technology. Kim shot 71 and is T-52nd at two-under for the tournament.
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