Australian golfer Cameron Smith is two shots off the third-round lead at the US PGA Tour event in Mississippi.
Americans Chris Kirk and Luke List each shot seven-under 65 to share the lead going into the final day while 23-year-old Queenslander Smith had a round of five under to be tied for sixth.
Kirk and List sit on 14 under at the Country Club of Jackson.
"I've tried to predict scores before, and I've never done a very good job of it, so I've kind of quit," said Kirk.
"I'm just going to go out and stay very aggressive, and I'll try to make as many birdies as I can, that's for sure."
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Cody Gribble (67), Canada's Graham DeLaet (68), and 2009 US Open champion Lucas Glover (68) were a stroke back.
Second-round leader Grayson Murray had a 72 to drop two shots behind.
He missed several short putts and had a double bogey on the shortest par-4 on the course.
Kirk, the highest-ranked player in the field at 76th, had eight birdies and a bogey.
His first PGA Tour title came in the event in 2011, when it was known as the Viking Classic and was played at Annandale Golf Club in nearby Madison.
He has won three times since, including twice in 2014, when he finished second in the FedEx Cup standings.
List, chasing his first PGA Tour victory, had seven birdies in a bogey-free round.
