Chilean Joaquin Niemann secured his place in a select club after claiming a six-stroke victory at the Greenbrier Classic on Sunday.

Niemann, 20, fired a six-under 64 in the final round in West Virginia on his way to a resounding win at the opening event of the 2019-20 PGA Tour season.

He became just the third player born outside the United States to win on the PGA Tour before age 21, joining major champions Seve Ballesteros and Rory McIlroy.

Niemann produced a brilliant performance, shooting four rounds in the 60s to finish at 21 under.

@JoacoNiemann is victorious @GBRMilitary!

The 20-year-old Chilean wins by SIX.

He becomes just the third player born outside the United States to have won on TOUR before age 21.#LiveUnderPar pic.twitter.com/eBuNStVRWF
— PGA TOUR (@PGATOUR) September 15, 2019

He ended up well clear of Tom Hoge (65), while Brian Harman (65), Harris English (67), Nate Lashley (69) and Richy Werenski (69) were tied for third at 14 under.

"Amazing. I've been thinking about this my whole life, since I started playing golf, so unbelievable," an emotional Niemann told the Golf Channel after his victory.

"I think I realise what happened today so I just need to calm down a little bit and just celebrate."

Niemann holed eight birdies and two bogeys during his final round, sealing his victory by picking up shots on his final three holes.

The perfect read at the perfect time. @JoacoNiemann leads by 4 with 4 holes left.#QuickHits pic.twitter.com/9NuO7vVgQ9
— PGA TOUR (@PGATOUR) September 15, 2019

Hoge mixed eight birdies with three bogeys in his 65, but the American finished six back from Niemann.