Sweden's Mikael Lundberg ripped up the script with a birdie on the first extra hole to deny local favourite Bernd Wiesberger a second Lyoness Open title.
The pair finished tied on 12 under par at Diamond Country Club after Lundberg surged through the field with a closing 65 and Wiesberger returned a 69 after letting slip a one-shot lead with three holes to play.
The players returned to the par-three 18th for the play-off and it was advantage Wiesberger after the tee shots, only for Lundberg to hole from 45 feet for an unlikely birdie.
Wiesberger was unable to match it from 18 feet and was therefore left with an anxious wait to see if he had done enough to move up to 60th in the world rankings to qualify for his US Open debut.
A victory would have guaranteed his place at Pinehurst, but the 28-year-old was now left to rely on results in the FedEx St Jude Classic on the PGA Tour.
Simon Thornton finished best of the Irish on four under.