20-year-old Kim Joo-hyung became the second-youngest player since 1932 to win a PGA Tour event – trailing only Jordan Spieth – as he produced a final-round 61 to run away with a five-stroke buffer and claim the Wyndham Championship at 20 under.

In doing so, he became the event's youngest ever winner, and after entering the last tournament of the season ranked in the 400s in the FedEx Cup standings, he booked his place in the playoffs later this month.

His final round included an incredible front-nine score of 27, with six birdies and an eagle, and making his win even more remarkable is the fact that he started his week with a quadruple bogey from his opening hole on Thursday.

Speaking to CBS after stepping off the final green, Kim said his ability to keep a sense of humour about his rough start was the key to bouncing back.

"I stayed very patient this week," he said. "I felt like after that quad, once I started to laugh it off I could feel like I was in a much better mental state. 

"Instead of being angry and depressed I just stayed in the moment – I can't believe I won with a quadruple bogey on the first hole – hopefully that doesn't happen again.

"It's definitely a week I will remember forever."

He added: "it was a hard day – I didn't know golf was this stressful before."

Finishing in a tie for second was Kim's South Korean compatriot Im Sung-jae and American John Huh at 15 under, with Ben Griffin alone in fourth at 14 under.

American trio Max McGreevy, Russell Henley and Taylor Moore tied for fifth at 13 under, and there was another two-stroke gap to the group rounding out the top-10 at 11 under consisting of England's Tyrrell Hatton, Australia's Cameron Percy, India's Anirban Lahiri, and Americans Brandon Wu and Chesson Hadley.

Germany's Stephan Jaeger posted Sunday's second-best round with a 62 to finish tied for 13th at 10 under, and Canada's Corey Conners produced a pair of 66s on the weekend to sit on the fringe of the top-20 after scraping through right on the cut-line, tied with Will Zalatoris at nine under.

Brandon Wu holed out an eagle to grab a share of the lead with Im Sung-jae moments before play was halted and ultimately suspended on Saturday at the Wyndham Championships due to inclement weather.

Only 12 of 86 players completed their third rounds on Saturday, with Im and Wu both managing just 11 holes before play was called off amid rain and lightning in Greensboro, North Carolina.

There are 10 players within two strokes of the lead including five chasing their first wins on the PGA Tour.

The lead duo are tied at 12-under, with the South Korean moving into joint top spot on the leaderboard after four birdies across his 11 holes.

American 25-year-old Wu landed a birdie on the 10th hole and followed that up with an eagle on the 11th to draw level with Im just before the horn blew to suspend play. After a lengthy delay, play was called off for the day with light fading.

Wu had shared the lead at the halfway point with Kim Joo-hyung and Ryan Moore but the latter slipped two shots back after two bogeys from his completed 10 holes on Saturday.

John Huh, who held the lead after a first-round nine-under-par 61, steadied to be equal second at 11-under-par through 11 holes alongside Kim who completed 10 holes.

Thailand's Kiradech Aphibarnrat was the only player sitting near the top who finished their third round on Saturday, to be 10-under-par, with none of the rest of the top 10 getting through more than 11 holes.

Irishman Shane Lowry only got through 13 holes having been forced to charter a private jet to make his tee time after leaving the course on Friday presuming he had missed the cut. Lowry is 11 shots off the pace.

The third round will resume at 7.30am local time on Sunday.

A poor second round from John Huh opened the door at the Wyndham Championship, with Brandon Wu, Kim Joo-hyung and Ryan Moore capitalising to claim a share of the lead at nine under heading into the weekend.

Huh was two strokes clear after his opening round nine-under 61, but he was 10 shots worse on his second trip around Sedgefield Country Club, shooting a one-over 71 to sit one off the lead.

Of the three leaders, Kim had the best round with his 64, posting seven birdies and one bogey, with Moore shooting a 66, and Wu getting around in 67. All three posted top-five putting days according to Data Golf's strokes gained stats, with Kim leading the field (4.61 strokes gained), Moore third (3.31) and Wu fifth (3.06).

One stroke off the lead along with Huh is American Russell Henley and South Korea's Im Sung-jae, with India's Anirban Lahiri part of the next group at seven under.

Japan's Satoshi Kodaira and Australia's Brett Drewitt are in the group tied for 10th at six under, England's Tyrrell Hatton is at five under, and Sweden's Henrik Norlander rode the second-best putting performance of the day to reach the weekend at four under.

Will Zalatoris responded to a poor opening round with a 66 to sneak one stroke inside the cut-line, Adam Scott and Michael Gligic are right on the cut-line at two under, and pre-tournament favourites Shane Lowry and Corey Conners missed out by one stroke.

John Huh leads by two strokes after the first round of the Wyndham Championship, shooting a career-low nine-under 61 in his first trip around Sedgefield Country Club on Thursday.

With seven birdies, one eagle and no bogeys in his round, Huh had his game working from all areas. According to Data Golf's strokes gained stats, the American was the second-best in the tee-to-green category (5.29 strokes gained), third in approach shots (3.25) and sixth in putting (3.21).

Speaking to the media after his round, Huh said he did not feel like he was playing his best, but he is glad to be in such a strong position after entering the week on the fringe of the FedEx Cup Playoffs.

"It’s kind of strange," he said, "because I wasn’t really feeling great with my game and I shoot my career low – it’s kind of weird. 

"Sort of mixed feelings, but I’ll take this any day. I was able to take advantage of a good break and good shots, that’s all I can say."

Adam Svensson shot a blistering 10-under 62 in the first round of the Barbasol Championship to lead the field by two strokes.

Canada's Svensson is taking advantage of the fact that most of the sport's biggest names are spending this week at the Scottish Open, posting seven birdies, two eagles and bogey in his round. On the four par-fives, he collected two birdies and two eagles.

Speaking to The Golf Channel after his round, he said he felt in good touch coming into the event.

"I was on the range today and I was feeling really good," he said. "I've been putting well, putting a lot of work in that. 

"It just kind of all came together today. I made two nice eagles. The one on eight was exceptional – made a 30-footer – but was just trying to stay in there because it was just so hot. 

"I was losing energy, I was trying to hydrate and stuff like that. I was just really relaxed and just tried to get through the day essentially."

Being a co-sanctioned event from both the PGA Tour and the DP World Tour, there was a strong international contingent near the top of the leaderboard.

Tied for second place at eight under are Portugal's Ricardo Gouveia and France's Robin Roussel, with the latter managing to go bogey-free.

There is an eight-man logjam tied for fourth at seven under, including Germany's Matti Schmid, Colombia's Camilo Villegas and England's David Skinns.

Another pair of Englishmen – Tom Lewis and Andrew Wilson – were a further shot back at six under, along with Australia's Cameron Percy, South Africa's Justin Walters and Germany's Yannick Paul.

Japan's Satoshi Kodaira, Chile's Hugo Leon and Sweden's Niklas Lemke are at five under, while Spain's Alejandro Canizares and South Korea's Noh Seung-yul shot four-under 68s – one stroke better than Thursday's average score.

After a top-10 finish at last week's John Deere Classic, Canada's Michael Gligic will be content with his opening 69, while John Huh shot a 70 as he looks for his third top-15 finish from his past five starts.