Rubuta ci gaba don wannan sakin layi - A matsayin karamin dan wasan curler, Mosaner ya wakilci Italiya a Gasar Cin Kofin Duniya na Junior Curling sau hudu. Ya buga wasa na uku ga Italiya a Gasar Cin Kofin Duniya ta Junior Curling ta 2012
, a cikin tawagar da Andrea Pilzer ta tsallake. Tawagar ta kammala a matsayi na 9. Daga nan Mosaner ya zama kyaftin din kungiyar matasa ta Italiya don wasannin matasa na duniya guda uku masu zuwa. A Gasar Cin Kofin Duniya ta Junior ta 2013, Mosaner ya jagoranci tawagarsa ta Pilzer, Daniele Ferrazza da Roberto Arman zuwa matsayi na 6 (5-4 rikodin). A Gasar Cin Kofin Curling ta Duniya ta 2014, ya jagoranci tawagarsa ta Sebastiano Arman, Ferrazza da Roberto Arman zuwa na biyar, inda suka yi rashin nasara a wasan da suka yi da Switzerland. A ƙarshe, a Gasar Cin Kofin Duniya ta Junior ta 2015, bai yi nasara ba, yana jagorantar tawagarsa ta Sebastiano Arman, Carlo Gottardi da Fabio Ribotta zuwa na 8 (3-6).