The 21-year-old produced a superb second jump of 198 metres to finish on 369 points, edging out Olympic gold medallist from Vancouver Gregor Schlierenzauer who had to settle for second.
Japan's Noriaki Kasai rounded off a superb weekend by taking third, just a day after he made history as the oldest ever winner of a World Cup event at 41.
Switzerland's Simon Ammann led by nine points after the first jump in Austria but missed out on the podium in the absence of the recent Four Hills champion Thomas Diethart.
And it was left to Prevc, who had finished second 24 hours before when Kasai made history, to claim the maiden win of his young career.
- Sports & Recreation
- Noriaki Kasai