The 22-year-old headed to her home state of California and Mammoth Mountain having pipped Canadian Rosalind Groenewoud to gold in the last half pipe event in December last year.
And history repeated itself as Sigourney once again got the better of her rival, with compatriot Maddie Bowman settling for bronze.
With maximum points so far Sigourney is 40 points ahead of Groenewoud on 200, while Bowman is third on 110.
And there was double joy for the home crowd in California as American David Wise collected gold in the men’s event.
Wise’s score of 94.4 held off the challenge of Canada’s Noah Bowman who had to settle for silver, while Frenchman Benoit Valentin took home bronze.
This victory propels Wise to the top of the overall half pipe World Cup standings, 15 points ahead of compatriot Torin Yater-Wallace who managed fifth, with Wing Tai Barrymore currently third.
Meanwhile in the slopestyle competition another Mammoth resident came out on top of the pile with Canadian Kaya Turski taking the victory with a score of 93.2 to go joint top of the World Cup standings.
The rest of the podium had an American feel with Devin Logan (87.6) taking second and Emilia Wint (83.4) third.
And in the men’s competition it was another local favourite Tom Wallisch who took a resounding victory, and a share of the overall World Cup lead, with a score of 96.4. The 24-year-old’s run was a cut above the rest with Canada’s Alex Bellemare (89.20) taking second and Joss Christensen (87.20) third.
And after taking the win Wallisch set his sights on keeping his Mammoth momentum up all the way until the 2014 Winter Olympics.
“Hopefully we all can build off this successful event as we move toward the Olympics in a couple of years,” he said.