Tony Finau produced a terrific Sunday performance to win the 3M Open with a final score of 17 under par – even if It was not quite a comfortable finish.

The American completed his final round with six birdies and two bogeys to post the equal second-best score of the day with a 67. One bogey came on the 18th after Finau teed off into the water, but he was never in any real danger after starting that hole with a four-stroke lead.

Finau's charge to the front of the field began during his back nine, when he rattled off four birdies over the course of six holes – including three in a row on 14, 15 and 16 – perfectly coinciding with the collapse of 54-hole leader Scott Piercy.

Speaking to CBS after stepping off the 18th green, Finau said it felt like he was a long way off the lead until it all started to shift.

"[It took] really everything I had," he said. "I was playing great, and every time I looked it up it seemed like I was four or five shots back, really all day.

"I really got things going down the back nine, and once I took control of the golf tournament it was a totally different mindset, trying to seal the deal.

"It's so special just to have my family here with me, and to celebrate this win with them… this one was for them."

Piercy began his day at 18 under with a four-stroke lead, and he was cruising early, making a couple of early birdies to jump out to 20 under, with his buffer extending to five. But everything began to fall apart on the eighth hole.

After back-to-back bogeys on eight and nine, Piercy also bogeyed 11, teased a bounce-back with a birdie on 12, and then capitulated with bogey, triple-bogey, bogey from his next three holes to go tumbling down the leaderboard. Over the course of eight holes, he dropped seven shots, completely eliminating himself from contention.

Piercy finished tied for fourth at 13 under after his 76, along with fellow Americans Tom Hoge and James Hahn, with Hahn's six-under 65 ending up two strokes better than any other final round.

That grouping was one stroke behind Argentina's Emiliano Grillo and South Korea Im Sung-jae, who were tied for second at 14 under.

Rounding out the top 10 were the English pairing of Danny Willett and Callum Tarren, tied for seventh at 10 under along with Greyson Sigg, with Chesson Hadley one shot back.

Recent PGA Tour winner J.T. Poston headlined the group at eight under, and Australia's Cam Davis was at seven under as he prepares to defend his Rocket Mortgage Classic crown this coming week.