Greg Chalmers increased his advantage in the Barracuda Championship on the back of a solid third-round performance in Reno.
The Australian recorded eight birdies and a bogey, picking up 15 points to open up a six-point advantage over his rivals in the only event on the PGA Tour to use a Modified Stableford format.
High points totals rather than low scores count in this $2.3m (£1.7m) tournament in Nevada - formerly known as the Reno-Tahoe Open.
The 42-year-old finished with seven birdies and a bogey to sit a half dozen points ahead of Ben Martin and Gary Woodland
Martin was the only player to sign for a better score than Chalmers in the third round, with eight birdies earning him 16 points and a share of second place with fellow American Woodland.
Scotland's Martin Laird, who led after the first day at Montreux Golf and Country Club, picked up six points after four birdies and two bogeys, leaving him fourth.