Europro Tour — Headfort's Brian Casey birdied two of his last three holes to rescue a disappointing day in the Clipper Logistics Players Championship at Moor Allerton Golf Club in Leeds.
As England's Elson carded a third-round 68, to move into a one-stroke lead over Mark Laskey on six under, overnight leader Casey shot a three over 74 to fall back to tied fifth.
The Headfort player is four strokes off the pace having made five bogeys in his first 10 holes.
But he rallied over the last seven, dropping just one more shot at the 14th to go with birdies at the 12th, 16th and 17th.
The final round of the 72-hole event takes place on Saturday and the winner will take home £12,000 from the increased £60,000 prize fund.
Casey will be hoping to finish on a high as he prepares to play on an invitation and make his European Tour debut in next week's M2M Russian Open.
Alan Dunbar (71) is tied 15th on level with Jonny Caldwell (76) 49th on five over.