Kammala jumla mai zuwa: An kira Hollenstein zuwa tawagar 'yan wasan Switzerland ta U20 don
Gasar Zakarun Duniya ta 2019 a Kanada. Ya jagoranci Switzerland zuwa matsayi na hudu, ya fadi zuwa Finland a wasan kusa da na karshe. Hollenstein ya sake kasancewa cikin ƙungiyar don Gasar Zakarun Duniya ta Junior ta 2020 a Jamhuriyar Czech.