Lee Kyoung-Hoon has recorded a one-shot victory to win the AT&T Byron Nelson for the second successive year.
The world number 88's only PGA Tour triumph came at this event 12 months ago, and he will now surge up the rankings after shooting a final-round 63 in Texas.
In a tournament which heavily featured low scoring, the South Korean hit an eagle and seven birdies, the last of those coming on the 18th hole which secured him the title.
Jordan Spieth had to settle for second spot after only recording a 67 on Sunday, with Hideki Matsuyama and Sebastian Munoz sharing third position.
Xander Schauffele was arguably the player of the day, posting a 61 to move 25 places up the leaderboard to finish in a tie for fifth alongside Justin Thomas and Ryan Palmer.
World number one Scottie Scheffler had to settle for 15th, with Ireland's Seamus Power a shot further adrift in 17th place.
