Whakaotihia te rerenga e whai ake nei: I a ia e tamariki ana, i tohu a Mosaner mo Itari i roto i nga whakataetae World Junior Curling Championship e wha. I tākaro ia hei tuatoru mō Itari i te
2012 World Junior Curling Championships, i runga i te kapa i whakahaeretia e Andrea Pilzer. I mutu te kapa i te tuaiwa. I muri mai ka noho a Mosaner hei rangatira mo te roopu rangatahi Itari mo nga World Juniors e toru e whai ake nei. I te 2013 World Junior Curling Championships, i arahi a Mosaner i tana roopu o Pilzer, Daniele Ferrazza me Roberto Arman ki te mutunga o te 6 o nga waahi (5-4 rekoata). I te 2014 World Junior Curling Championships, i arahina e ia tana roopu o Sebastiano Arman, Ferrazza me Roberto Arman ki te tuarima o nga waahi, ka ngaro i te tukinga-tukinga ki Switzerland. Hei whakamutunga, i te 2015 World Junior Curling Championships, he iti ake te angitu, i arahi i tana roopu o Sebastiano Arman, Carlo Gottardi me Fabio Ribotta ki te mutunga o te 8th (3-6).