Ian Poulter continued his resurgence on the PGA Tour by taking a one-shot lead into the final round of the RBC Heritage.
Two weeks ago, the Englishman clinched a dramatic play-off win at the Houston Open, which earned him a spot in the field for last weekend's Masters.
"Still standing - that's a good thing", Poulter said after his bogey-free round at Hilton Head - his sixth PGA Tour event in as many weeks.
Two shots behind DeChambeau were Chesson Hadley (68), past RBC Heritage victor Brandt Snedeker (64), Luke List (64) and first-round leader Rory Sabbatini (70).More news: Bok Women whacked on Gold Coast
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Horschel made a big move up the leaderboard and joined Kim on 12 under by draining a 25-footer at the 13th, his fourth birdie in a five-hole stretch around the turn, as Poulter holed from eight feet at the 12th to make it a three-way tie at the top.
Twice he had to take a penalty and ended the day with three birdies, four bogeys and a double to miss the cut by as much as four shots.
American Bryson DeChambeau, who led after day two at Harbour Town, fell off the pace with a four-over 75.
Dustin Johnson also struggled Saturday, firing a 1-over 72 to finish his third round tied for 41st at 3 under.