The Genève-Servette HC competes in a league know by what name prior to the 2017-2018 season?
National League (ice hockey) The National League (NL) is a professional ice hockey league in Switzerland. It is the top tier of the Swiss hockey league system and of the two-tier National League. Prior to the 2017–18 season, the league was officially called National League A.
2017–18 OHL season The 2017–18 OHL season is the 38th season of the Ontario Hockey League (OHL), in which twenty teams will play 68 games each according to the regular season schedule, from September 21, 2017 to March 18, 2018.