Lahiri followed up his first round of 65 with a 66, and at nine-under he is four shots behind the leaders -- Ryan Armour (61) and Webb Simpson (64) -- who are at 13-under 127 halfway through the PGA TOUR's final event of the regular season.
Henrik Stenson was a stroke behind them after a 66.
Ollie Schniederjans and Vaughn Taylor and were 11. Schniederjans shot 63, Taylor had a 66.
First-round leader Matt Every followed his 61 with a 72 to slip six strokes off the lead.
"Coming in, I slowed myself and made myself more precise on the greens. I am not missing the greens and I have been playing par-5s well. This is a kind of a track where one can be aggressive with wedges. You can hit the wedges on at least 10 of the holes," he added.
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