Former World No 1 Luke Donald has given himself a chance of ending a win drought that stretches back to 2013 after taking a one-shot lead at the RBC Heritage heading into the final round.
The Englishman, three times a runner-up at the Harbour Town course, kept errors to a minimum despite slick greens and blustery winds, grinding out a two-under round of 69 to reach seven-under for the tournament.
He is a stroke clear of the American duo Charley Hoffman (71) and Jason Kokrak (68), but the current World No 1 Jason Day plummeted down the leaderboard.
The Aussie is bidding for a seventh tournament win in just 14 starts and was joint-leader overnight with Hoffman but never got his round back on track after running up a double-bogey at the par-four third, where his tee shot found water.
He added six bogeys on the back nine as the tough conditions took their toll and dropped into a share of 40th after a round of 79.
However, Donald made four birdies and just two bogeys to finish in front after a day in which seven players held at least a share of the lead at one point.
Donald has five top-three finishes without a victory on Hilton Head Island and the current World No 95 said: "I haven't been in this position as much as I would have liked the last couple of years.
"But certainly I have been in this position many times, especially around this place, and I'll draw from that.
"I think if there's one tournament I've been in this position the most, it would be this one."
A disappointed Day reflected: "I knew something was up when my ball hit a tree [at the third] and bounced 80 yards right into the hazard. From there, I just got a couple of bad breaks.
"It's really tough to fight back after that, just got to try and improve tomorrow and see how it goes."
Patton Kizzire had a better day and is all alone in fourth place after shooting a 71 to reach five-under, two shots behind Donald.
A trio of players are three shots back on four-under in the shape of South Africa's Branden Grace (69), Open champion Zach Johnson (70) and his fellow American Chris Kirk (71).
Kevin Na's 66 was the best round of the day and he is in a group of five at three-under which also includes Scotland's Russell Knox.