Jason Dufner had two eagles on the way to a six-under 65 and a one-shot lead heading into the final round of the US PGA Tour's RBC Heritage.
American Dufner, the 2013 PGA Championship winner, started three shots behind co-leaders Graham DeLaet of Canada and Englishman Luke Donald.
But Dufner quickly closed that deficit with eagles on both front-nine par-5s at the second and fifth holes.
He also birdied No.15, Harbour Town Golf Link's other par-5 as part of a three-birdie run that put him in front at 13 under.
DeLaet was second after a 69, his third straight sub-70 round after having just five in five previous appearances here.
Americans Kevin Kisner and Webb Simpson were at 11 under.
Kisner shot a 66, and Simpson, the former US Open champ, had a 68.
Cameron Smith had an even-par 71 to be the best-placed Australian at five under in a tie for 20th.
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