The former PGA Champion, looking for a first victory since his 2016 major success and without a worldwide top 10 since May 2018, carded eight birdies on his way to a bogey-free 64 at Country Club of Jackson.
Walker, who has since dropped to world No 352, Is joined on eight under by four-time PGA Tour winner Charley Hoffman, Kevin Chappell and defending champion Sebastian Munoz.
"I did a lot of stuff really well, a lot of good bunker shots," Walker said. "When I missed, I was in a good position. I didn't short-side myself and putted extremely well for the day, so it was pretty good."
Beginning on the back nine, Walker missed birdie chances from inside six feet on both his first two holes before holing a 15-footer at the 13th and getting up and down from the sand to pick up a shot at the par-five next.
Walker made a 15-foot birdie at the 15th and followed sand saves over his next two holes by converting a 20-footer from the fringe at the 18th and posting a two-putt birdie at the par-five third. ราคาบอลไหล
Back-to-back birdies from the fifth and a tap-in gain at the eighth helped Walker close a blemish-free card, as Hoffman - teeing off at the same time but from the first - also got off to hot start to get to eight under.
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