Austria's Michael Hayböck was second and Norwegian Kenneth Gangnes was third.
Today, Prevc won first place with jumps of 138.5 and 142 metres, which added up to 304.2 points.
His third consecutive victory further strengthened his lead in the overall World Cut standings.
Domen Prevc, who was second yesterday, finished fifth today with jumps of 137 and 128.5 metres and 273.8 points.
The only other Slovenian competitor, Robert Kranjec, landed in 21st place.