Thongchai Jaidee has edged one stroke clear of Joost Luiten and Ross Fisher in the Wales Open at Celtic Manor.
The Thai shot seven birdies during his four-under par round of 67, while Luiten stormed from 18th place in the field with a magnificent 64.
Overnight leader Fisher could not build on yesterday's 66 but will resume level with the Dutchman on six-under.
The Englishman missed an eight-foot putt for eagle on the last, which would have seen him share the lead heading into tomorrow's final round.
Jaidee, whose four victories on the European Tour have all come in Asia, pitched out from a greenside bunker to card a birdie at 18 and claim the outright lead.