Yorkshire's Iain Pyman carded a third round 68 to lead the BMW Russian Open by two strokes from Scotland's Greig Hutcheon after a dramatic turnaround over the closing four holes at Moscow Country Club.
Pyman is on 14-under-par 202 and Hutcheon on 204 after a 73 just when it seemed that the Scot would keep the lead he built with a first day 63. But anything can happen in golf and no one could have forecast the five-shot swing that highlighted a sunny day in Moscow.
Paired together in the last match out, Hutcheon stood on the tee at the 528-yard 15th with a comfortable three-shot advantage. But the Leeds man cut the deficit to one with a superb eagle after hitting a three-wood to three feet and holing the putt.
Then at the 548-yard 17th, Hutcheon ran up a double-bogey seven in painful fashion after his second shot finished in sand some 70 yards from the green from where he got a flier over the green into a bush.
"It was unplayable and there was nowhere within two club lengths to drop the ball. So I had to return to the bunker to play my fifth shot," said the 26-year-old Scot. "I found the green this time but I left my first putt inches short.
"It was a blow but I struggled a bit today. Still, Iain and I will be paired together again tomorrow so it should be a great final day."
Pyman, also 26, felt he needed two or three birdies on the back nine to catch his rival but couldn't have bargained for the drama that unfolded.
"I played very steady all day but after holing a couple of early putts I couldn't find another until I holed that three-footer for eagle at 15," he said. "Greig got unlucky at 17. Tomorrow I'll just play my own game. As long as I am satisfied with my round that will be fine. If someone shoots 65 to win then so be it."
Hennie Otto, from South Africa is a threat at three shots back, while Fredrik Andersson of Sweden carded a best-of-the-day 66 for fourth spot on 206.