The 21-year-old Russian, who won her second European title on home soil in Paramonovo earlier this year, gave warning that she could end Germany's winning streak with a storming first run.
Ivanova clocked 42.818 seconds first time out for a lead of almost 0.2 ahead of Anke Wischnewski and, despite another German Natalie Geisenberger going quicker on run two, she held on.
The Russian was still the second fastest for an overall winning time of 1:25.604 and a narrow winning margin of 0.039 ahead Geisenberger while Wischnewski was third, 0.283 behind overall.
That ensured world silver medallist Ivanova was the first non-German slider to win a World Cup race this season with Wischnewski winning the first and Geisenberger the next two.
Germany's presence is still everywhere though with Tatjana Hufner fourth and Corinna Martini fifth while Geisenberger leads the overall World Cup standings ahead of Wischnewski and the latter.
Tobias Wendl and Tobias Arlt also maintained their unbeaten start to the doubles season with a fourth successive victory and second straight ahead of Austrian's Peter Penz and Georg Fischler.
Wendl and Arlt posted the fastest time during both runs for a winning effort of 1:25.104 that was 0.452 ahead of Penz and Fischler while Italian pair Christian Oberstolz and Patrick Gruber were third.
The German duo have 400 World Cup points to lead overall with Penz and Fischler second with 300 while team-mates Toni Eggert and Sascha Benecken, eighth in Sigulda, are third with 282.
- Sports & Recreation
- Natalie Geisenberger
- Anke Wischnewski