Now that Sam Burns has figured out how to turn an early lead into a victory, it's already time to try again. Burns birdied six of his last eight holes Friday for a 10-under 62 and a two-stroke lead over Alex Noren at 17 under after the second round of the AT&T Byron Nelson. J.J. Spaun was 12 under, following a first-round 63 that left him tied with Jordan Spieth with a 69.