Brendon Todd claimed his maiden victory on the PGA Tour in his 77th start with a two-shot win at the Byron Nelson Championship in Texas.
The 28-year-old had held at least a share of the lead since the end of the second round, and maintained his composure with a final round 66 to finish on 14-under.
Former Open champion Louis Oosthuizen shared the third-round lead with Todd but struggled on the final day, dropping down the leaderboard with a four-over round of 74.
Todd's biggest challenge came from 2003 Masters champion Mike Weir, with the left-handed Canadian having a resurgent week with four rounds in the 60s to finish second on 12-under.
Four birdies in his first five holes gave Weir a flying start, and although the 44-year-old dropped a couple of shots along the way, he shot 67 to post 10-under with Todd still having two holes to play.
A nervy tee-shot on the par-three 17th was then followed by a poor chip, but Todd rallied to rattle in a 15-foot putt to save his par and give him a two-shot lead to carry down the last.
It was not the first piece of escapology from Todd during his round, as he holed his bunker shot on the second for a birdie and then used the back of his wedge and a left-handed swing to escape from next a tree to save par on the 13th.
Todd made no mistake on 18 with a par to claim his first triumph and continue a remarkable run of first-time winners on the PGA Tour this season; he is the eighth player to achieve the feat so far.
"It feels amazing, it's a big monkey off the back, it's been a tough career up to now with many ups and downs but it's great to be on top," said Todd.
"That was huge on 17, I asked my caddie where I was and he thought I was two up so that was huge on 17 to make that putt."