Lahiri bogeyed the 460-yard par-4 sixth, as he landed on the green in 2 and three-putting, moving him to one-over for the round. Tied for the lead with five holes to go, Putnam made bogey from the bunker on No. 14 and Kuchar birdied the next two holes to seize control. Lahiri's only birdie of the day came on ninth when he landed his third shot to seven feet and holed it for a birdie.
The 40-year-old is aiming for his second win in three starts on the Tour after claiming the Mayakoba Golf Classic earlier this season.
Kuchar matched the lowest 36-hole score of his PGA Tour career.
But he rallied strongly to produce six birdies in the remaining holes, including five on an unblemished back nine, to secure the $US1,152,000 winner's cheque.
Having made only bogey through 54 holes to build a two-shot lead, Kuchar had three bogeys in his opening five holes Sunday and fell one shot behind Putnam.
Five-time PGA Tour victor Hideki Matsuyama is 10 shots off the lead, tied for 35th, after also shooting a 3-under 67.
Kuchar's final-round 66 put him at 22-under 258 for the tournament, with Putnam finishing at 18 under with a 2-under 68 on Sunday.
Before he made the turn, Thomas rolled in a 12-foot putt for an eagle on the 9th hole. "I'm sure when I think about it. a lot of good things have happened".
"Didn't feel as easy as the first two days, " Putnam said.
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The only other time Kuchar won twice in the same season was in 2013, when he won the Match Play Championship in Arizona in February and the Memorial in early June. Just needed to make some better swings.
"I'm just going to stay aggressive".
Putnam, who won for the first time previous year in the Barracuda Championship held opposite a World Golf Championship, did his best to stay in reach.
Marc Leishman (64), Hudson Swafford (64) and Chez Reavie (67) also finished in a tie for third. You don't get many chances like that and it was nice to be there and been able to finish it off. ...
Lahiri, who is playing his first event of 2019, is now four-under 136.
Spieth had a 66 and missed the cut by just one shot.
Both courses require keeping the ball in play, and Kuchar has done that well over three rounds.
"I want to see how great this year can be", Kuchar said.
Andrew Putnam took the lead over Kuchar as the two began their third round as the one-time PGA Tour victor impressed.