Keegan Bradley will take a one-shot lead into the final round of the HP Byron Nelson Championship after shooting a two-under-par 68 in Texas.
Bradley has been at the top of the leaderboard from the outset following a stunning first round of 60 on Thursday.
However, Sunday promises to be a fascinating final day with South Korea's Bae Sang-moon making real inroads into Bradley's advantage with a 66 and Tom Gillis a further shot adrift after a 67.
Bradley had a mixed day on Saturday with five birdies accompanied by three dropped shots, the last of which was his third bogey of the week at the final par-four 18th - something he may regret given Bae's efforts.
Five birdies and one bogey saw him finish with a third consecutive round of 66 and closing in on Bradley's 13-under mark.
Gillis carded four birdies and a bogey for a 67 with Scott Piercy's 66 - including six birdies - seeing him end the day in fourth.
South Africa's 2011 Masters champion Charl Schwartzel (69) was among a four-way tie for fifth on eight under alongside American trio Gary Woodland (68), Harris English (68) and John Huh (69).
Padraig Harrington lies on one over following a 71.
"I'm going to hit it right down the middle tomorrow, hit it on the green and make birdie!" - Keegan Bradley
Despite seeing his lead trimmed from three shots to one, Bradley was pleased with his day's work and quietly fancied his chances heading into Sunday.
"I played really solid today - one of the most solid rounds of the year - so I'm really excited," the 26-year-old, who won this event two years ago, said on www.pgatour.com.
"I'm going to need to shoot a solid round tomorrow. These guys are playing really good golf.
"There's a lot of really good players at the top of the leaderboard. But if I go out there and shoot a good round, I like my chances."
And the 2011 USPGA champion has particularly set his sights on mastering the troublesome final hole.
"Tomorrow's the day," he said. "I'm going to hit it right down the middle tomorrow, hit it on the green and make birdie!"