Three clear of the field entering the final round of the Austrian Open, Thorbjorn Olesen was expected to pick up his second European Tour win of 2012.
Instead, it was Bernd Wiesberger of the host country who claimed his second win of the year.
Wiesberger closed with 7-under 65 at Diamond CC to win his national open by three shots over Shane Lowry and Thomas Levet.
Olesen shot 74 to finish fifth, five back of the Austrian at 14 under. The Dane was the only player in the top 14 to shoot an over-par final round.
With the win, Wiesberger becomes the second Austrian, after Markus Brier, to win his national championship. He also becomes the first Austrian to win multiple times in a single season, already having won the Ballantine's Championship in April. He joins South Africans Branden Grace and Louis Oosthuizen as the only multiple-time winners this season on the European Tour.