After taking the lead in the opening round, JT Poston is inching closer to completing a wire-to-wire victory at the John Deere Classic in Illinois.
The 29-year-old American has produced stunning performances all weekend, and kept pace during Saturday's third round despite risking his lead with two late bogeys.
Approaching the 17th, Poston was seemingly ending the session on a negative note, but an eagle on the par-5 helped him regain his three-shot lead.
He kept his spot at the top of the leaderboard after carding a four-under 67 during the third round.
Argentina's Emiliano Grillo piled on the pressure with a 65 on Saturday, which landed him in second on 16-under, level with the American duo of Scott Stallings and Denny McCarthy.
England's Callum Tarren sits close behind in fifth on 15-under after managing a successive 65.
Poston, who is chasing just the second PGA Tour victory of his career, was quick to admit that his third round performance wasn't as sharp as his opening two rounds.
"The first two days I had everything working great - hitting it great off the tee, irons and making a lot of putts," said Poston.
"Today wasn't as sharp tee to green and I didn't putt it as well. To be able to still shoot four under, which is still very solid, gives me some confidence going into tomorrow.
"Hopefully I hit it better, but if I don't, I've still got the ability to shoot a decent number."
Grillo's 65 will have Poston sweating during Sunday's session, and the Argentinian believes there's plenty of opportunity on the back nine for him to close up to Poston.
"If you're shooting 68, 69 you're falling behind. You've got to look at that 67, 66 range, especially out here with soft greens and perfect conditions," said Grillo.
"There is barely any wind and the guys who are shooting lower than three-under-par on the front are playing really well - the opportunities are mostly on the back nine."
Play resumes on Sunday, July 3, and will decide the winner of the tournament's $7,100,000 purse.