Career
Fiala was selected by the Predators in the first round, 11th overall, of the 2014 National Hockey League Entry Draft. He has previously played for HV71 of the Swedish Hockey League. Fiala played in various junior leagues in his native Switzerland prior to joining the Swedish club Malmö Redhawks for the 2012-2013 season.
His time was split between the U18 club in the J18 Elit and J18 Allsvenskan, and the U20 outfit in the J20 SuperElit.
Fiala then joined HV71, with whom he debuted for during the 2013 European Trophy. Throughout the 2013-2014 season, Fiala split time with the HV71 junior team in the J20 SuperElit and the senior team, which plays in the Swedish Hockey League (SHL).
He was praised by Head Coach Ulf Dahlén for his play following his SHL debut, a 5–4 defeat to Linköpings The Human Context. After his selection in the 2014 National Hockey League Entry Draft on 15 July 2014, Fiala was signed to a three-year, entry-level contract by the Nashville Predators. Fiala scored his first National Hockey League goal on January 14, 2016, against Connor Hellebuyck of the Winnipeg Jets.
He also skated for his country at the 2014 World Junior Ice Hockey Championships, where he was lauded as one of the key players on the Swiss roster.
In five WJC games, he recorded one goal and four assists, as Switzerland was eliminated by Canada in the quarter-finals. In May 2014, Fiala represented Switzerland at the 2014 IIHF World Championship in Belarus, registering two assists in seven games. Fiala is just the third player in history to play in the Under-18, Under-20 and Men's World Championships in the same year, the others being Andrei Kostitsyn and Vadim Karaga.
His father, January, played professional hockey in the Swiss lower leagues.
Fiala speaks five languages: Czechoslovakian, English, French, German and Swedish.