Lahiri, who was struck by back spasms on the front-nine in the first round, had struggled his way to a 77 on the opening day.
Lahiri, winner of the Malaysian Open and the Hero Indian Open this season on European Tour, is now nine-over 149 for two rounds and placed way down in the 72nd place, exactly where he was after the first day.

Meanwhile, Jim Furyk shot a second successive 66 and moved into lead at eight-under 132. The 45-year-old Furyk was four shots ahead of Shane Lowery (66), Bubba Watson (66) and Dustin Johnson (67).
Jordan Spieth, who has never played well at Firestone, found an under-par round with 68 and is now tied eighth at two-under 138.
Lahiri, who was hit by back spasms in the first round, said, "It got a lot better overnight and the warm weather helped. I enjoyed the sweat for a change."
"When I worked up a sweat, it kind of got flushed out. I was moving good. I have got my yardage back, though my timing is slightly off in early parts of the round because of what happened yesterday," he added.

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