Lindsey Vonn skis fastest first split but loses control and seconds over new terrain.
Opening FIS Alpine World Cup races of the 2015-16 season set for Oct. 24-25.
Hirscher collects the giant slalom globe and further distances himself from Jansrud in the overall.
Austria sits 1-2 heading into second run at World Championships.
Pre-race favorite Mikaela Shiffrin produces gold medal performance to become youngest Olympic slalom champion in history.