Jordan Spieth finished a second successive day with a one-stroke lead over compatriot Jason Kokrak at the Charles Schwab Challenge in Fort Worth, Texas.
Remarkably there was no change atop the leaderboard from Friday to Saturday night, as Spieth and playing partner Kokrak shot four-under 66s to move to 15- and 14-under respectively.
Sergio Garcia edged into outright third at 10-under, having shared the spot with two rivals at the half-way stage.
England's Ian Poulter gave himself an outside chance of victory by shooting the round of the day - a six-under 64 - which left him sharing fourth place with Colombia's Sebastian Munoz (70) at eight-under, seven shots off the pace.
Justin Rose took a 69 to share 17th place at five-under.
Spieth finally conceded his first bogey of the tournament after 41 holes, having twice found the rough at the par four fifth. But that was his only blemish of the day as four birdies on the front nine and three more at 13, 15 and, crucially, at 18 kept him in the lead.
Kokrak birdied his first two holes to briefly snatch the lead before dropping behind his playing partner again after bogeys at five and six. Birdies at 12, 14, 15 and 17 had him sharing the front-running before Spieth birdied the last.
Poulter surged up 26 spots on the leaderboard through his superb round, featuring four birdies in five holes from the second to the sixth.
After a bogey five on the seventh, the 45-year-old came home with a blemish-free back nine including birdies at 10, 15 and 17.
