Kooch, who opened with rounds of 63-63, stayed on track with three birdies on the front nine and carded a 54-hole score of 18-under 192. 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.
"I didn't hit the ball as well as first two days, so glad the putter was still warm", he said. "But I kept plugging along, and I knew good things were going to happen".
"I tell people that nerves in golf are kind of like public speaking", Kuchar said.
Kuchar became the first multiple victor on the PGA Tour this season, having ended a drought of more than four years when he captured the Mayakoba Classic in Mexico last November. But, he carded five birdies and four pars on the back nine to secure victory.
He won the Mayakoba Classic in Mexico two months ago, another finish that was tighter than it needed to be.
However, Putnam handed back the initiative with a scrappy dropped shot at 14, and Kuchar seized his chance to open up a commanding lead when he holed back-to-back birdie putts from 12 feet at 15 and 16. His best season to date probably came in 2013 when he won the Memorial and the WGC-Match Play Championship en route to $5.6 million in earnings.
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.
Putnam, who collected his maiden PGA Tour win at last year's Barracuda Championship, nailed a tricky three-footer for par at the last to clinch outright second on 18 under.
He finished at 22-under 258, the third-lowest total in Waialae history behind the PGA Tour record of 253 by Justin Thomas in 2017 and Jimmy Walker's 72-hole score of 257 when he won in 2015. He went long of the second green, leading to bogey. "I look forward to the rest of the year to try and continue to see how great this year can be".
"Apparently, I need to go buy a lottery ticket today", Reavie said.
Australia's Marc Leishman finished in a four-way tie for third place at 17 under with Canada's Corey Conners and Americans Hudson Swafford and Chez Reavie.
"For not playing well at all and being on the bad end of the draw, to miss the cut by one is reassuring", Spieth said.
American Kuchar - who is chasing his first win since November - remains in control following his four-under-par 66 at Wai'alae Country Club in Honolulu. He closed with a birdie Saturday to cut Kuchar's lead to just two.