Halkaan ka sii aqri faallo - Hollenstein waxaa loogu magac daray xulka qaranka Switzerland ee U20 ee tartanka 2019 World Junior Championships
waxay ku nooshahay Canada. Wuxuu hogaamiyay Switzerland oo gashay kaalinta afaraad, waxaana ku dhacay Finland semi-finalka. Hollenstein wuxuu mar kale ka mid ahaa kooxda tartanka Horyaalka Adduunka ee 2020 ee Czech Republic.