A bogey on the last dropped him to 20 under for the tournament but the West Australian's fourth career win was all but sealed earlier on Sunday by a brilliant chip-in from 50 metres for eagle on the 9th hole.

That put four shots between him and nearest rival Japan's Rikuya Hoshino (67, 68, 64, 68) at the turn.

A bogey on the 10th was a rare blip, Lee (64, 66, 66, 68) again chipping within a metre of the 12th to reinstate the buffer and cap a dominant week at Brisbane's Royal Queensland Golf Club.

There were no signs of nerves after he got up-and-down for par on the 17th.

Lee donned a chef's hat in a nod to his 'Let Him Cook' motto, leading a clap with the crowd then running to the 18th tee to drill his tee shot down the middle of the fairway.

"Let Him Cook"....he did. PHOTO: Getty Images.

He found a greenside bunker and missed the putt to drop a shot and finish two strokes short of the tournament record – 22 under set by Jed Morgan in January last year.

Lee was 12 under on the par-5s across the tournament in marching to his second title in his last four starts following a wire-to-wire Macau Open victory just six weeks ago.

"Unbelievable ... I made it interesting early on and through the middle, but ended up hanging on," he said.

"He (Hoshino) kept knocking on the door; I knew I needed to keep playing well and do my thing ... really proud."

Job done! PHOTO: Australian Golf Media.

Marc Leishman (16 under) carded a seven-under 64 to surge into third place ahead of Curtis Luck (15 under).

Adam Scott (12 under) stood still after he'd cruised into title contention at the tournament's midway point to finish sixth and continue his near four-year title drought.

The 25-year-old Lee had barely put a foot wrong across three days of golf at the riverside venue, seemingly not hitting top gear until he needed some magic on Sunday.

Lee celebrates his chip-in eagle on the 9th hole. PHOTO: Australian Golf Media.

Going right with his first shot on the par-5 9th, Lee squeezed a shot under some trees and remained right of the large green.

His chip bounced three times and checked, curling into the cup to send the large gallery and those gathered around the 9th green wild for the charismatic rising star.

Lee, younger brother of three-time Greg Norman Medallist Minjee, celebrated the moment of the tournament too.

"That was probably the best atmosphere shot I've ever hit," he said.

"I've had a few chip-ins but at that point it was getting close, I was in a pretty average position after the tee shot.

"It was amazing. I want to see it straight away. One of the best shots I've probably hit."

An emotional Min Woo embraces his father, Soonam, after claiming the win. PHOTO: Getty Images.

Defending champion Cameron Smith crashed out after two forgettable rounds and spent the weekend working on his putting ahead of the Australian Open, which begins in Sydney on Thursday.

Chile's Joaquin Niemann (13 under) landed an ace on the 4th hole just after Hoshino had erased Lee's overnight lead of three shots in a manic opening 30 minutes of play.

But Lee steadied, almost making a hole-in-one of his own on the same hole to quickly reinstate some breathing space.

– Murray Wenzel