Kevin Na went almost seven years between his first and second career PGA Tour victories, the latter coming on Sunday at A Military Tribute at The Greenbrier.
The 34-year old Korean-born American bagged six birdies in seven holes during the final round as he carded a six-under par 64 at West Sulphur Springs to finish well clear of overnight joint-leader Kelly Kraft.
"Big confidence boost", Na said.
"It's nice to get that second trophy", Na said. It s a handsome trophy. "I'm getting better as the week goes on, and I'm building some momentum for my two-week stretch over in the United Kingdom, and I'm looking forward to getting over there".
Na's lone PGA victory came in 2011 after eight years on the Tour.
"Tough to describe how fantastic this feels", Knox said.
"It feels fantastic. I see the record every time on TV - the most top fives, the most top 10s without a win", he told CBS. I m always up there. "I've been close so many years and failed so many times", said Na, who turned pro at age 17.
"It took me eight years to win my first title. And it took seven", he said with a laugh.
Kraft (70) wound up second, while Jason Kokrak (67) and Brandt Snedeker (64) tied for third at 13 under.
Kraft was rolling early, shooting even par through the first nine holes before bagging birdies on 10, 11 and 12 to stretch his lead. His long birdie putt curled left to right and into the cup.
Five birdies in six holes on the front nine put Na in control and he finished at 19-under-par 261 at The Old White TPC for his second career win.
"So I babied it and it broke off", he said. "The most important thing today was that I never got ahead of myself - I stayed within myself".
Na's spectacular putting was the difference on Sunday as he negotiated the hard, fast greens under sunny skies in West Virginia better than Kraft, whose three-putt bogey on 14 all but ended his hopes of a maiden PGA Tour victory.
Defending champion Xander Schauffele and USA compatriot Kevin Na shared third on 197 with countryman Sam Saunders, grandson of the late golf legend Arnold Palmer, fifth on 198.
Bubba Watson, in search of his fourth win of the season, dropped into a tie for 13th with a final-round 2-over 72.