Seamus Power remains in the hunt at the Barbasol Championship after a five-under 67 left him just three shots off the leader heading for Sunday's final round.
The Waterford man notched seven birdies and a couple of bogeys - one of which came on the last - as he kept himself in contention in Kentucky on 16-under overall.
JT Poston fired a six-under 66 for the second consecutive round Saturday to take a one-shot lead.
Poston posted a second consecutive clean card, with six birdies at Keene TraceGolf Club to sit at 19-under for the tournament.
Luke List carded a 65 to sit alone in second at 18-under.
James Hahn made the biggest leap on moving day, posting a scorching 12-under 60 to move into a third-place tie with Joseph Bramlett (67), two shots back at 17-under. Hahn had two eagles and eight birdies in his bogey-free round.
Power and Swede David Lingmerth are tied for fifth three shots back, and five players are tied for seventh at 15-under, four shots back of the leader.
Poston and List will be the final pairing on Sunday.
List also had a clean round. He posted two birdies on the front before catching fire on the back, with five birdies.
But the round of the day went to Hahn, who posted his first birdie on No 4. He carded his first eagle on No 5 and then made four birdies in a row, holes 7 to 10. He would make another three birdies and another eagle.