Defending champion Joost Luiten and home favourite Bernd Wiesberger were locked together heading into the closing stages of the Lyoness Open powered by Greenfinity.
Luiten began the final round with a two shot lead but saw that wiped out when he bogeyed the second after playing partner Wiesberger had birdied the long first.
Wiesberger, who would secure a US Open debut at Pinehurst next week with a repeat of his 2012 victory at Diamond Country Club, then delighted the large crowds by taking the outright lead with a birdie on the third.
But Luiten then recorded his first birdie of the day on the par five fourth to get back on level terms, although any thoughts of a two-horse race were quashed at the fifth, with both players then dropping a shot on the fifth to fall into a three-way tie with Paraguay's Fabrizio Zanotti.
Luiten, who had gone in the water off the tee at the fifth, reclaimed the lead with a birdie from ten feet on the seventh, but then failed to get up and down from thick rough over the back of the ninth green.
That left the 28 year old tied with Wiesberger on ten under par, with Zanotti and Sweden's Mikael Lundberg a shot behind.
Wiesberger claimed the outright lead with a curling birdie putt from 25 feet on the tenth, but was soon joined at the top of the leaderboard by Lundberg, who held the halfway lead before a third round of 76.
Four birdies in his first five holes had helped Lundberg to the turn in 33, while he then picked up shots on the 11th, 13th and 14th to join Wiesberger on 11 under par.
Lundberg made it three birdies in a row on the 15th to move into the lead on 12 under, only for Wiesberger to promptly birdie the 13th to get back on level terms.
Luiten's hopes looked to be fading but he crucially followed Wiesberger in from ten feet for his own birdie to close the gap to one.
