Kuchar ended a almost five-year drought when he won the Mayakoba Classic in November, his eighth PGA Tour win, and he said it was a good recent experience to have in the memory bank.
The Sony Open is more about work than play, and he's having just as much fun.
It was a hard day for 11-time PGA Tour champion Spieth, who had four bogeys and just one birdie to be tied for 127th and 12 shots off the pace.
An inability to birdie the par-five 18th, where he hit a poor third shot, was the only minor complaint Kuchar had after a four-under-par 66 at Waialae Country Club in Honolulu. Chez Reavie (65) and Stewart Cink (62) were four behind.
"I was trying to think back to any round I even had more than one hole-out and I couldn't think of any", Reavie said after signing for a 5-under 65 that leaves him 10 under for the week and four off the pace.
In his third round, Lahiri found seven of 14 fairways and 14 of 18 greens in regulation but left no misses on putts within 10 feet.
Former major championship winners Jordan Spieth and Zach Johnson missed the cut by one stroke on Friday.
Keith Mitchell and Chez Reavie are tied for 3rd five shots from the lead and it would appear that those further back would need a little help from Kuchar and something special themselves tomorrow if they are to have any chance of catching the 40 year old. "It is the golf I like to play to stay out of trouble", he said.
South African native Rory Sabbatini played his first event under the Slovakian flag, and shot a second round 67 to move to five-under overall, nine shots adrift of Kuchar.
The PGA Tour began keeping hole-by-hole records in 1983 and no one had made three eagles in one round on par fours since.
Matt Kuchar made it look easy Saturday in the Sony Open.
Kuchar has been one of the most consistent players on the Tour over the past few years, finishing in the top 20 in FedEx Cup standings in 2017, 2016 and 2015.