Nyora kuenderera mberi kweiyi ndima - Fiala akatamba muIvan Hlinka Memorial Tournament muna 2012 na2013 senhengo yechikwata chenyika cheSwitzerland U18. Akakwikwidzawo nyika yake pa2014 World Junior Ice Hockey Championships
, kwaakarumbidzwa somumwe wevatambi vanokosha muSwitzerland roster. Mumitambo mishanu yeWJC, akarekodha chibodzwa chimwe uye zvinobatsira zvina, sezvo Switzerland yakabviswa neCanada mumakwikwi ekupedzisira. Muna Chivabvu 2014, Fiala akamiririra Switzerland pa2014 IIHF World Championship muBelarus, achinyoresa vaviri vanobatsira mumitambo minomwe. Fiala ndiye mutambi wechitatu munhoroondo yekutamba muU-18, World Junior, uye World Championship mugore rimwe chete (vaviri vekutanga vaive Andrei Kostitsyn naVadim Karaga, vese vari veBelarus muna 2003). Fiala akapindawo mu2018 IIHF World Championship, uko maSwitzerland akahwina sirivheri. Mumutambo wokupedzisira wakanangana neSweden Fiala aiva nomukana wokuwana menduru yegoridhe munguva yokuwedzera asi kupfura kwake kwakanga kwakaderera zvikuru. Pashure pokurasikirwa nokurwisana, vaSwitzerland vaifanira kugutsikana nesirivha.