Kang entered the final round with a three-shot leadAT & T Byron Nelson final victory board-23 S Kang (SK); -21 S Piercy (US), M Every (US); -20 B Koepka (US) Other selected: -15 P Harrington (Ire); -13 H Stenson (Swe); -10 M Laird (Sco)
Sung Kang from South Korea won his first PGA Tour victory over AT & T Byron Nelson in Dallas.
The 31-year-old, who set the track record of 61 in the second round, had to complete 27 holes on the final day due to weather delays.
He finished 23rd while second place Scott Piercy of the United States ended the tournament without making a bogey.
Brooks Koepka, who is trying to defend his American PGA Championship title this week, finished fourth in 20.
"These guys are incredible," said Kang. "The victory feels great."