Kang leads Nelson

DALLAS — Sung Kang and his caddie did some calculations on the driving range before the second round of the Byron Nelson on an unseasonably cool day with some breezy conditions.

“The biggest thing was we needed to figure how shorter the ball is going to fly,” Sung said. “So we just trusted the number just hit it, and then worked out good.”

Kang was pretty much right on, matching the Trinity Forest course record with a 10-under 61 on Friday to take the lead at 16-under. He led by four strokes over playing partner Matt Every, who had his second consecutive round of 65, and Tyler Duncan (66).

Brooks Koepka, the world's No. 3-ranked player who goes to next week's PGA Championship as defending champion, was fourth at 11 under after a 66. He overcame two early bogeys with six birdies in an 11-hole stretch that included four in a row late.

“Solid round, just trying to keep pace,” Koepka said. “I would like to have been in the lead. But I mean, hey 61 today was pretty darn impressive.”

Koepka was a stroke ahead of Rory Sabbatini, who had a bogey-free 65.

With temperatures in the low 50s, Kang opened with a 9-foot birdie on the par-5 No. 1 hole. His approach to within a foot of the cup at the 311-yard No. 5 set up a string of six birdies in a row.

“I don't know what the guys are talking about. Perfect and awesome and nice conditions for the course,” Kang said jokingly after getting a post-round fist pump from Jordan Spieth, a member at Trinity Forest who shot 67 to get to 7 under.