Jason Dufner had two eagles in a six-under par 65 on Saturday to take a one-shot lead going into the final round of the US PGA Tour's Heritage in Hilton Head, South Carolina.
Dufner eagled both par-fives on the front nine, rolling in an 11-footer at the second and pitching in from off the green at the fifth hole at Harbour Town.
His 13-under par total of 200 put him one in front of Canada's Graham DeLaet, who lost a share of the lead with a bogey at 18 to cap a 69 for 201.
Dufner also had three bogeys on the front nine, but in addition to his eagles he had five birdies on the day, four of them on a solid back nine.
"The front nine was a little bit of a rollercoaster," Dufner said. "The back nine was really clean. I was really happy how I played on the back nine."
Overnight co-leader DeLaet opened his round with a bogey, then had four birdies before stumbling again at the last.
He was one stroke in front of Americans Kevin Kisner, who carded a 66, and Webb Simpson, who signed for a 68.
England's Ian Poulter was alone on 203 after a 69. Poulter had powered to the lead with four birdies on the front nine before opening the back nine with a double bogey and a bogey.
England's Luke Donald, who shared the 36-hole lead, had two bogeys and a birdie in a one-over 72 that saw him drop four shots off the pace.
He was joined on 204 by Americans Wesley Bryan and William McGirt, who both shot 68.
© 2017 AFP