finished at two-over 72 and a total of one-over 211 to slip to Tied-37th after the penultimate round of the Charles Schwab Challenge here.
He continued to have trouble with putts between 10 and 15 feet as he failed to convert no less than six in that zone, besides another one less than seven feet in the third round.
Kevin Na settled for a one-under 69 a day after shooting 62 and at nine-under he is in lead.
Right behind him there are four players, including the local favorite Jordan Spieth and Jim Furyk, the 2003 US Open champion who hasn't won in four years. There was also C T Pan, who broke through for a maiden win recently at RBC Heritage at Hilton Head, and Tony Finau, who has been looking to add to his sole win in 2016 in Puerto Rico.
Lahiri hit 12 of 18 greens in regulation during his third round. He birdied just once on second and dropped three bogeys on sixth, seventh and 17th.
The 49-year-old Furyk, who has just one of his 17 PGA TOUR victories in the past nine years, was second at the Players Championship in March.
This year has been terrific for him. Furyk, winless since 2015 at Hilton Head. He matched the 68 from Spieth, whose last victory was the 2017 British Open. Pan also shot 68 while Finau carded 71 to be seven-under.
Defending champion Justin Rose, the highest-ranked player in the field at No. 3, shot his second 74 in three rounds and is 5 over.
Second-round leader Jonas Blixt shot 74 and is four shots back.
The best rounds came from players with earlier tee times. Mackenzie Hughes shot 65 to join Spieth, Furyk and company. Charley Hoffman had the day's best round at 7-under 63 and was tied at 6 under with Austin Cook, who shot 65.
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