Min Woo Lee and Brooks Koepka go into the final round tied for the lead on 11 under par at the 2025 FedEx Open de France.
The pair reeled in the long-time leader, Lee's playing partner Marcus Armitage, on the back nine on Saturday - Koepka shining with a run of five successive birdies on the difficult stretch from the 13th.
Lee carded a second successive 68 to stay alongside the American and one ahead of Armitage, who shot a level-par 71 and was joined in third by Michael Kim and Guido Migliozzi after their rounds of 66.
Armitage's overnight two-shot lead briefly swelled to four with a birdie at the second after Lee and Jeff Winther, the third member of the final group, both bogeyed the first - but Lee bounced back with a brilliant 37-foot birdie putt at the third where a bogey left Armitage back where he started.
A birdie at the next took the Englishman three ahead and he matched Lee's three at the fifth after another fine putt from 18 feet by the Australian.
Lee birdied the sixth and, after a quiet end to the pair's front nine, picked up another at the tenth to move within one shot.
Kim and Migliozzi were sharing third by that point after both reaching four under through 13 holes and nine under for the tournament, and they soon had company as five-time Major Champion Koepka matched both marks.
Koepka and Migliozzi both birdied the next as well to move to ten under but two holes behind them, the tournament lead changed hands for the first time since early on Thursday as Armitage bogeyed the 13th while Lee spun a superb approach to tap-in range for a birdie.
Koepka was not finished there, though, holing from seven feet at the 16th and hitting his approach at the next to three feet to make it five birdies in a row.
That took him to 12 under and though he bogeyed the last, his 65 was enough for a share of the 54-hole lead.
"Yeah, it was pretty good," said Koepka. "Putted a lot better.
"I feel like my game has been trending in the right direction. It's just the results haven't been there. I'm pleased with the work I've put in over the last few months so hopefully got a chance to win tomorrow.
"I've felt very uncomfortable over the putts pretty much all year, just a little bit of hand position. We've got it sorted now where I feel like I'm striking the putts very well, hitting them on line and feeling confident and that's honestly half the battle."
Lee said: "Just pretty solid again, I didn't do anything spectacular in the back nine, just hung in there.
"You can really get away with the moment - you've just got to keep hitting shots and keep mentally strong. You've just got to keep going until the end."
Armitage was proud to remain firmly in contention for the title despite not making a birdie after the fifth hole on Saturday.
"I was sort of at 50 per cent of what I can do and I've still got a shout going into tomorrow," he said. "It's a shame I couldn't pull off few birdies on the back nine but I just wasn't driving it well enough.
"You've just got to keep grinding, even though you feel like you're not playing well, just keep telling yourself you're still in it.
"I'm a quality player, I've got to keep reminding myself of that. That's the reason I'm stood here now and in contention and I've got to go out there with that attitude."
On a tightly packed leaderboard, France's Jeong weon Ko was alongside Australian Elvis Smylie on nine under with Freddy Schott and Darius van Driel a further shot back.
Mikael Lindberg, Todd Clements and Antoine Rozner at seven under rounded out a dozen players covered by four shots at the head of the field.
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