Putnam, who played college golf at Pepperdine and claimed his first PGA Tour victory previous year in the Barracuda Championship, capped his 67 with an eight-foot birdie putt on the last hole.
The 25-year-old, whose best finish last season was a tie for 39th, was trailing clubhouse-leader Andrew Putnam but leapfrogged him after four consecutive birdies on the back nine and one final one on the par-five 18th hole.
It was a short week for Spieth after a long break.
Kuchar has won just twice in the dozen times he has held the 36-hole lead, but he feels with the way he is playing that he can add to his birdie count. He fired a 3-under 67 to reach 16 under. Those were the only players within five shots of the lead, and all of them are chasing Kuchar.
Reavie holed out from the fairway three times for eagle, all on par 4s, a feat that hadn't been accomplished since the PGA Tour first started tracking hole-by-hole records in 1983.
"Before the other two I just hit the shot and I was trying to see if it was going at the hole". Never expected it to go in. "You're always surprised when they drop". "It is the golf I like to play to stay out of trouble", he said.
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Dallas entered with the fifth-best rushing defense in the National Football League , allowing 94.6 yards per game. They were especially impressive in limiting the vaunted Cowboys running game to just 50 yards.
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. For now, he has to figure out how to make up four shots on Kuchar.
Kuchar sometimes comes to Hawaii with his wife and two kids even when he's not playing golf. He likes it better when he can play a few tournaments.
Clearly, the 40-year-old is in a better spot than when he had gone more than three years without winning and was left off the Ryder Cup team for the first time in 10 years.
Kuchar, who had been winless for almost four years until his win at the Mayakoba Classic late in 2018 now appears likely to add a 9th PGA Tour title just three months after his 8th. He felt as though he was grinding too hard, and that's not a trait he wears well.