Ricky Barnes is the man to beat in the fourth round after surging into a one-stroke lead on the penultimate day of the Texas Open.
Despite bogeying his final hole, a third-round 67 was enough for Barnes to leapfrog overnight leader Brendan Steele on Saturday.
Barnes had only dropped one shot heading to the 18th hole at TPC San Antonio - the par-five ninth - which was cancelled out by seven birdies in Texas, as he enjoyed a three-shot buffer atop the leaderboard.
But an uncharacteristic snap-hook at the 18th resulted in a messy bogey and reduced his lead to one, when Steele birdied the same hole.
Steele, who teed off with a three-shot lead, could only muster an even-par 72 to drop down to second at 10 under through 54 holes.
The one-time PGA Tour winner, whose solitary title came here at the Texas Open in 2011, had two birdies and as many bogeys in a mixed bag.
Former world number one Luke Donald (68) and Charley Hoffman (70) are two shots off the pace, tied for third.
Patrick Reed carded a two-under-par 70 to be a shot further back.
Billy Horschel (67), Nick Taylor (66), Chad Collins (67), Padraig Harrington (68), Martin Piller (71) and Jon Curran (71) are seven under after three rounds.
Further down the leaderboard at three under is Branden Grace (69), who won his first PGA Tour title at the RBC Heritage last week.
Daniel Summerhays - runner-up in 2014 - is also eight shots behind Barnes.