Kuchar wobbled to a 1-over 36 on the front nine and let a whole host of players back into the festivities before making three straight 3s on the back nine and two birdies in his first three holes.
Matt Kuchar made it look easy Saturday in the Sony Open.
"To shoot seven under back-to-back is unexpected, but awfully excited", Kuchar said.
Putnam carded three birdies through the first five holes to have a one-shot lead.
So odd was this round that Reavie made more eagles than birdies, and the one shot that made him think the ball might go in the hole led to a par.
He posted a 14-under 126 halfway total, one stroke better than fellow American Andrew Putnam, who shot a bogey-free 65. Five 3s in your first seven holes on the back nine with the tournament in the balance is a nice way to close a two-week stay in Hawaii.
"It was not at all what I was looking for", Kuchar told the Golf Channel about his poor start.
Andrew was tough there.
Armed with a three-stroke advantage with just two holes remaining, Kuchar held firm and, after a cast-iron par at the penultimate hole, he completed a comprehensive win with his 24th birdie of the tournament at the 72nd hole.
Kuchar shot 22-under 258 for the week in Honolulu and overcame a rocky final-round start to lock up the four-shot win. Instead, it turned into the American's first top-10 finish since the 2017 WGC-Bridgestone Invitational and his best result since winning the Desert Classic nearly exactly two years ago.
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.
Bryson DeChambeau made a move with 63, tying his best score on the PGA Tour.
AUSTRALIAN golfer Marc Leishman has stormed up the leaderboard to be in a tie for fifth after a second-round 64 at the PGA Tour's Sony Open in Hawaii, but former world No.1s Adam Scott and Jordan Spieth have missed the cut.
DIVOTS: Gary Woodland, who didn't shoot worse than 68 last week and still had to settle for runner-up at Kapalua, was among 10 players who missed the 54-hole cut because more than 78 players made it to the weekend. "I know that I was playing well, so I tried to stay confident". Love is not playing next week on the Big Island because he is playing the Singapore Open.