American Kisner emerged from the six-man playoff in Greensboro, North Carolina to claim his fourth PGA Tour title and deny Australia's former No.1 his 15th.

In addition to Scott, Kisner defeated Kevin Na, South African Branden Grace, South Korean Si Woo Kim and Canadian Roger Sloan at the second play-off hole to win the tour's regular season finale.

The group tied at 15-under 265, with extra holes required to separate them as they chased valuable FedExCup points.

RIGHT: Adam Scott misses a short putt, which would have given him victory. PHOTO: Getty Images. 

With Scott looking at a four-footer for birdie on the first extra hole, Kisner thought he would have to hole a pitch from short of the 18th green just to stay in the playoff, and he nearly did it.

Kisner grimaced as his ball settled just right of the cup.

But Scott's short putt missed badly and all six players went back to the 18th tee.

This time, only Kisner gave himself a close look at birdie on the 505-yard closing hole and he made no mistake with his three-foot putt to break his play-off drought – which stood at 0-5.

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"To be standing here is pretty sweet," Kisner said.

“Every time you win out here, it's hard, and you never know when it's going to happen again so you've got to cherish every time.

“This year's been somewhat of a struggle for me, I kind of started the year with a playoff loss and struggled through the spring and started to find some form here late in the summer and rounding into form going into the Playoffs. So, to cap off the season with a win and head to the FedExCup Playoffs, moving up the list and having a chance to win the FedExCup championship is just an awesome week.”

RIGHT: Kevin Kisner makes his birdie at the second play-off hole to claim the win. PHOTO: Getty Images.

Kisner said he was surprised the play-off went beyond one extra hole and paid credit to Scott for bouncing back after his missed putt.

“I never thought that Adam was going to miss that putt,” Kisner said. “The only thing I could think of was he probably had to wait on that putt longer than any putt he's ever had to wait on to win, with five guys going ahead and putting before him.

“Credit to him, he came right back and hit another great drive and a great shot.”

It may have been an anti-climactic finish for Scott, who had only enjoyed one previous top-10 finish on the tour this year – but his joint second-place has rocketed him up the FedExCup standings.

Scott entered the week No.121 in the standings, just inside the top 125 who qualify for the first leg of the playoffs starting on Thursday, he's now shot up to No.82.

After carding a 64 on Saturday to get in the mix at Sedgefield Country Club, Scott shot a brilliant final round five under 65, which included eight birdies.

Kim shot 64 on Sunday while Kisner, Grace, Na and Sloan each closed with 66.

It was the third six-man playoff on the PGA Tour and the first since Robert Allenby won at Riviera in 2001.

Overnight leader Russell Henley reached 17-under after a birdie on the 10th hole but bogeyed three of the next four to finish at 14-under in a three-way share of seventh.

There was drama through the final round of the tour's last regular-season event as players outside the post-season sought to get in.

It looked like 2018 FedEx Cup champion Justin Rose, who started the week 138th, had done enough to make the 125-man field for The Northern Trust but the Englishman missed a five-footer for par on the final hole that dropped him to 126th – first outside the play-off field.

Sloan was one of three players to jump up into the top 125 and earn himself a start in the lucrative playoffs.