Luke Donald will take yet another lead into the RBC Heritage final round as Jason Day faltered and fell out of contention on Saturday.
Englishman Donald carded a two-under 69 at Harbour Town Golf Links to move into seven under, holding a one-shot lead through 54 holes.
The 38-year-old has an incredible record at the PGA Tour event, albeit without tasting success.
Donald has been runner-up three times - and led through three rounds on two of those occasions - and third twice.
He made three birdies on his first eight holes to set up his round on Saturday as he moved into the lead.
Donald's nearest challengers are Jason Kokrak (68) and Charley Hoffman (71), who are a shot back.
Patton Kizzire is outright fourth at five under after an even-par 71.
Hoffman had shared the overnight lead with Day and Kevin Chappell, whose four-over 75 saw him drop into a tie for 13th.
Yet that paled in comparison to Day's struggles as he produced a forgettable eight-over 79.
A tee shot into the water at the third started his problems as he double-bogeyed but his day got worse after being two over on the front nine.
World number one Day bogeyed six holes on the back nine as he failed to back up his 67 and 69 and slipped back to two over.
American Bryson DeChambeau, in his first tournament as a professional, is in a better spot after a 72 left him at two under.