Wyndham Clark produced a final-day round of 60 to win the CJ Cup Byron Nelson by three shots and become just the 10th man to finish a four-round tournament in 30 under par or better since 1983.
The American, who had carded rounds of 66, 63 and 65, landed an eagle and nine birdies to leapfrog overnight leader Si Woo Kim to the title.
Clark's nerveless approach shot to the 18th left him with a two-and-a-half foot putt for a three, and he duly obliged to land a fourth PGA Tour crown with a 30-under par total score of 254.
South Korean Kim, who himself went round the par-71 course in 60 on Friday, could only manage a 65 to slip to second place on 27 under, with defending champion Scottie Scheffler two shots behind in third.
Seamus Power recorded a top-20 finish after his final round 67 saw him post a 15 under par score, tied-19th overall.
Power had lost ground with an underwhelming round of 71 on Saturday but he concluded his week on a high note, with five birdies on Sunday.
