Kang surges into Byron Nelson lead with 61

South Korean Sung Kang carded a 10-under-par 61 as he surged to the top of the leaderboard on Friday.

Sung Kang   -  (Getty Images)

Sung Kang produced a dominant performance to claim a four-stroke lead after the second round of the Bryon Nelson.

South Korean Kang carded a 10-under-par 61 as he surged to the top of the leaderboard on Friday.

Kang – who is looking for his first PGA Tour win – converted six consecutive birdies from the fifth hole, helping him to 16 under heading into the weekend at Trinity Forest Golf Club.

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Americans Matt Every (65) and Tyler Duncan (66) moved into a tie for second, while three-time major champion Brooks Koepka is a stroke further ack at 11 under.

Reigning U.S. Open champion Koepka dropped from third after the first round to fourth, despite a five-under-par 66.

Former world number one Jordan Spieth, meanwhile, posted a 67 to be nine shots off the pace.

Denny McCarthy – the solo leader after round one – had a six-over showing that dropped him far down the leaderboard into a tie for 67th.