Maverick McNealy, with another 63, was two strokes behind. Patrick Fishburn, with yet another 63, was four back at 12 under with Sahith Theegala (66). Theegala won the Fortinet Championship last year for his first tour victory.
“A lot of low scores out there,” Theegala said. “I don’t know how, still feels hard walking off the 18th green, there’s so much water, so many stressful shots. Just hats off to the guys for shooting 64s and 63s, especially on the top of the board.”
Four shots back to start the day, Vegas birdied Nos. 5 and 6 and added three more two-birdie bursts on the back nine – on Nos. 11-12, 14-15 and 17-18. He made a 5-footer on the par-3 17th and tapped in on 18.
