Switzerland defeated Iceland 6-0 in their first match of the League of Nations on Saturday, when Xherdan Shaqiri played a stellar role.
The Liverpool winger scored his team's third goal and was involved in another three in the second half as Vladimir Petkovic Side ran unrest in St Gallen.
Steven Zuber criticized the hosts ahead in the 13th minute before Denis Zakaria scored his first international goal after Shaqiri's free-kick deflected from Fabian Schar.
Shaqiri was credited with the third minute 53 when his free kick bounced in the head of Birkir Bjarnason, who spent two years playing for Basel in Switzerland's top flight.
Haris Seferovic scored a good fourth, drilling from the edge of the box after Schar touched Shaqiri's pass on his way, and Benfica striker squared for debutant Albian Ajeti to make it 5-0 four more minutes late.
Admir Mehmedi composed a miserable exit for the 2016 European Championship quarter-finals, his simple final coming to the end of a quick counterattack involving midfielder Shaqiri and Borussia Monchengladbach Zakaria.
The last time Iceland conceded five or more goals was in their 5-2 defeat by France in the European Championship two years ago. They had not lost 6-0 since a World Cup qualifying match against Denmark in 2001.