The 28-year-old Indian, who was Tied-third after two rounds, is playing his first full season on the PGA Tour. He rallied from a bogey on fourth and a double bogey on seventh with four birdies between eighth and 14th holes. A good final round can still bring him back into Top-10, which will be a good start to the PGA Tour season.
Lahiri who shot a bogey free 64 on first day and then 68 on second day, is 11-under through 54 holes in a tournament, which has turned out to be a birdie-fest of sorts.
Jason Dufner, who has been winless since the 2013 PGA Championships, added an eight-under 64 after 64-65 on first two days. Dufner had a great finish birdieing seven of his final nine holes to take a two-shot advantage into the final round with one final round left at the PGA West's TPC Stadium Course.
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But his story on day three was one of missed putts. Lahiri missed birdie putts inside 10 feet on at least four occasions on the first, fourth, 10th and par-5 16th. Besides that he missed a 12-footer for par after going into the water on fifth, missed a 14-footer for birdie on sixth and missed a 15-footer for bogey when he again went into water on par-4 seventh.
Jamie Lovemark was second after a 65 on the Stadium Course. Adam Hadwin had a 64 on the Nicklaus Course to get to 20 under. The Canadian missed a chance to get closer, bogeying the par-5 15th after hitting into the water and closing with three pars.
Phil Mickelson was tied for fifth at 17 under in his first start since The Presidents Cup in October and first since splitting with swing coach Butch Harmon to work with Andrew Getson. He had a bogey-free 66 at the Stadium Course, holing a flop shot for birdie on the 10th hole.
David Lingmerth was five strokes back at 18 under after a 62 on the Nicklaus Course. The Swede had six straight birdies from No. 14 to No. 1, eagled the par-5 fifth, birdied the seventh and closed with two pars.