The Victorian claimed a wire-to-wire win at the BMW Championship at Conway Farms, making it consecutive Aussie wins at the venue after Jason Day emerged victorious in 2015.

The usually laid-back Leishman admitted after his third round the defeat at the hands of Jordan Spieth two weeks ago at TPC Boston affected him a little more than normal and gave him extra motivation heading into the penultimate event of the PGA Tour season.

“Generally I said to my wife if I have a bad round just give me ten minutes and I'll be all right. That one probably took a day. It stung a bit,” Leishman said of his close call in Boston.

And the 33-year-old’s motivation was clear from the outset at Conway Farms, opening with a nine under par 62 to take a lead he wouldn’t relinquish for the next three days.

Leishman continued to pile on the birdies during the second and third rounds and entered the final day at 19-under with a five shot lead over Rickie Fowler and compatriot Jason Day with his game feeling “better than it ever has in all respects”.

Leishman pumps his first after rolling in a birdie putt at the 15th. PHOTO: Getty Images.

The under-rated player from Warrnambool showed no signs of early nerves matching playing partner Fowler’s birdie at the 1st hole to maintain his lead and from then on Leishman was never seriously challenged throughout the round that yielded six birdies and two bogies.

Englishman Justin Rose applied some back nine pressure to the Australian, getting to within two shots, before Leishman holed 30- and 10-foot birdie putts at the 15th and 16th holes respectively to pull away once again.

“Going wire to wire, first time I've done that in a PGA Tour event,” he said after securing the title. “Backing up, that back nine last week at the Dell and, you know, when the pressure got put on and on that back nine by Rosie I reacted with birdies.”

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Leishman capped off his near perfect week with a birdie at the 72nd hole, draining a putt from the fringe of the par-5 18th green to complete a four under 67 for a 23 under par total, setting a new tournament scoring record. It was also his third Tour win and the second of 2017 in a special week for Leishman and his family.

"You’ve got to do something pretty drastically wrong to lose a four shot lead with two to play. With a par-5 there, you just never know."

September is Sepsis Awareness month and during the BMW Leishman and his fellow players wore ribbons to help draw attention to the disease that nearly claimed the life of his wife Audrey in 2015.

“I think there's 250,000 people just from the United States who die of sepsis every year and a lot of people don't know what sepsis is,” he said after the third round. “I didn't know what it was when Audrey got sick. I googled it. I'm like oh, that's not good.”

Leishman’s birdie at the last stretched the final margin back to five shots, with Fowler and Rose sharing second place after the Englishman closed with 65 and Fowler matched Leishman’s 67. But after losing a two-shot lead two weeks ago in Boston Leishman took nothing for granted as he closed out his final round.

“You’ve got to do something pretty drastically wrong to lose a four shot lead with two to play. With a par-5 there, you just never know,” said Leishman of his cautious approach to the final holes.

Leishman celebrates with his sons Oliver and Harry after winning. PHOTO: Gregory Shamus/Getty Images.

With a new caddie on the bag and new putter in hand, Day was a further two shots back at 16 under alone in fourth place. The Queenslander will be left to rue an inconsistent back nine on Sunday that included two bogies on par-5s and a double bogey five at the par-3 11th hole that effectively put an end to his challenge.

"To win the Presidents Cup would be massive, that would be a highlight of my career, the whole team's career.” - Marc Leishman.

Cameron Smith was the only other Australian in the field earning a tie for 12th, which wasn’t enough to earn him a place in the 30-man Tour Championship field alongside Leishman and Day. Smith finished his season in 46th place.

Thanks to his victory Leishman is now fourth on the FedEx Cup standings and controls his own destiny at East Lake. If he wins the final tournament of the year, he wins the FedEx Cup and $10million.

“I had my sights set high for the FedEx Cup and trying to get into that top-5,” Leishman said. “And really if I have another good week next week, who knows what might happen.”

But the season long title isn’t the only cup the Australian has his eyes on over the coming weeks.

“To win the Presidents Cup would be massive, that would be a highlight of my career, the whole team's career,” he said. “Lot of hard work and obviously the Americans have got an awesome team and we'll have to play great. That's certainly something for us to all work towards.”

Despite slipping to a T58 finish in Illinois, Jason Dufner secured 30th spot in the standings and the last place in the Tour Championship while Jordan Spieth tied for seventh to hold on to the No.1 spot heading to Atlanta, where he will attempt to claim his second FedEx Cup title.