After a first-round 63, 21-times PGA Tour winner Davis Love III posted a 69 to fall four strokes off the pace, where he was joined by Russell Henley (64) and New Zealand's Danny Lee (68), the defending champion.
After a late finish on Thursday, Munoz was happy he did not have too long to think about his lead before getting back to business on Friday and made another strong start with four birdies in his first seven holes in ideal morning conditions.
Though he could not quite maintain his run, he had no complaints about his position, and eight-foot par-save at the last further buoying his spirits.
“It's fantastic,” he told reporters. “No regrets. Excited.”
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Munoz hopes to benefit from the experience of sharing the halfway lead four weeks ago in Memphis, where he plunged over the weekend to finish equal 60th after playing the final 36 holes in 11-over.
“I feel like Memphis taught me that maybe I was caring too much, trying to hit too many perfect shots all the time,” said the PGA Tour rookie.
Lee, meanwhile, bounced back from a double-bogey at the par-five 12th, his third hole, and stayed in the hunt to successfully defend his title after a two-year wait after floods forced the event to be cancelled last year.
Lee said the course really suited his game.
“I love hitting three woods off the tee and some of the courses it’s too long to do that, but this course it just sets up perfect for a lot of those,” he added.
(Reporting by Andrew Both in Cary, North Carolina; Editing by Peter Rutherford)
