South Korea's women's team beat hosts Finland on the opening day of the World Curling Federation World Qualification Event in Lohja.
The South Koreans triumphed 12-3 at the Kisakallio Sports Institute.
They are joined at the top of the round-robin standings by Italy, Norway and Turkey.
Italy defeated Estonia 8-4, while Norway overcame Mexico 9-3 and Turkey claimed a 13-5 win over Australia.
In the men's event, Poland were the first of four teams to secure victory after beating Mexico 12-2.
The other matches saw Finland defeat China 8-3, Russia overcome Japan 8-4 and Czech Republic edge England 5-3.
Two women's and two men's teams will earn a spot at their respective World Championships in Lohja.
Prince George in Canada is set to host the World Women’s Curling Championship from March 14 to 22, while the World Men’s Curling Championship will be held in the Scottish city of Glasgow from March 28 to April 5.