Washington - South Korea's Kang Sung-hoon fired six birdies in a row on his way to a bogey-free 10-under par 61 on Friday to grab the clubhouse lead in the second round of the PGA Tour's Byron Nelson tournament.
Kang, seeking his first PGA title, stood on 16-under 126 after 36 holes at Trinity Forest Golf Club in Dallas, four strokes ahead of Matt Every with afternoon starters still on the course.
Aided by cool early conditions, the Dallas resident opened with a birdie, his approach at the par-5 first landing inches from the cup.
"It was perfect and awesome," Kang said.
"I live in Dallas, about 30 minutes from the golf course, and I've never seen weather like this in May. I knew it was going to be cold and windy so I really tried to prepare for how far the ball was going to go this morning and it worked out great."
Kang began his run of six birdies in a row at the par-4 fifth, landing his approach inches from the cup. He sank a six-foot birdie putt at the sixth and one half as long at the par-5 seventh.
He followed with a birdie from seven feet at the par-3 seventh, another from six feet at the ninth and capped the run by sinking a 21-foot birdie putt to begin the back nine.
"I just tried to keep it in play," Kang said.
"There are some par-5s so we can make some birdies and some short par-3s. I just tried to take advantage of those holes and miss it in the right spots. I missed it in the right spots where I needed to miss it and it worked out great."
Kang, who fired a 60 at Pebble Beach in 2016, added birdie putts from 18 feet at the par-4 13th, 12 feet at the par-5 14th and 11 feet at the par-4 16th. But he wasn't thinking about finishing with two more birdies to shoot 59.
"I hadn't thought about 59," he said.
"I thought it was pretty far away until I finished."
Kang was just short on a 25-foot birdie putt at the par-3 17th and needed to sink a 14-footer to save par at 18.
Leading scores after Friday's second round of the Byron Nelson tournament (par-71, USA unless noted):
126 - Kang Sung-hoon (KOR) 65-61
130 - Matt Every 65-65, Tyler Duncan 64-66
131 - Brooks Koepka 65-66
132 - Rory Sabbatini (SVK) 67-65
133 - Martin Laird (SCO) 67-66, Beau Hossler 67-66, Roberto Daz (MEX) 66-67
134 - Michael Thompson 66-68
135 - Jordan Spieth 68-67, Matt Jones (AUS) 65-70, Jonas Blixt (SWE) 65-70, Sebastian Munoz (COL) 69-66, Stephan Jaeger (GER) 69-66, Doug Ghim 69-66, Zack Sucher 67-68