Lahiri was 10-under 134, one behind the leader Jamie Lovemark (67-66). The Indian, the highest world ranked player in the field, had a superb start and may well have been the joint leader, but for a three-putt bogey on the last, when the 10-footer for par curled away from the cup.
"I made a ton of putts on the front nine. I have not putted that good in a while," admitted Lahiri, who tied for fifth at the recent PGA Championship.
Lahiri hit only 50 per cent of the 14 fairways and found only 11 greens in regulation but his putted was the key. He needed 32 putts in the opening round but only 22 in the second.
Lying 16th overnight Lahiri, winner of the Malaysian Open and Hero Indian Open this season, began with a birdie on the tenth on a morning that had steady showers.
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After the opening birdie, Lahiri was on fire as he rolled in four more on the trot from 12th to 15th to be five-under through the first six holes. He took the momentum into the second nine with some fine putting that included some good par saves.
Lahiri birdied the third, fifth and seventh and moved into a share of the lead before a three-putt bogey on the finishing hole, the ninth, saw him drop to second.
Sitting atop the leaderboard was Jamie Lovemark, who birdied all four par-5s en route to a 6-under 66. Lovemark was 11-under through two rounds at the Sycamore Hills Golf Club course and Lahiri was one shot behind.