Chiaki Matsumura helped Japan to their second and third win of the World Mixed Doubles Curling Championship with Yasumasa Tanida ©Getty Images

Japan and Norway are the only unbeaten teams at the World Mixed Doubles Curling Championship after the second day of action in Gangneung.

Chiaki Matsumura and Yasumasa Tanida chalked up their third win of the Championship for Japan with impressive victories against the United States and Sweden in Group B at the Gangneung Curling Centre.

They scored twice in the final end to beat the US' Cory Thiesse and Korey Dropkin 7-5, and claimed an 8-7 extra end victory over Therese Westman and Robin Ahlberg of Sweden.

Martine Rønning and Mathias Brænden clinched a 6-4 win for Norway against Turkey's Dilşat Yıldız and Bilal Ömer Çakır with an end to spare, then eased past Austria's Hannah Augustin and Martin Reichel 6-2.

The Swiss team of women's world champion Briar Schwaller-Hürlimann and men's World Championship bronze medallist Yannick Schwaller earned its second win with an 8-7 extra end victory against Spain's Oihane Otaegi and Mikel Unanue, but was then beaten 7-2 by the US.

In the other Group B matches, Turkey earned their second win of the Championship by seeing off Germany's Pia-Lisa Schöll and Klaudius Harsch 12-6.

Austria earned their first victory by beating Germany 11-6, Sweden got off the mark with a 10-3 thrashing of England's Lina Opel and Michael Opel, and Spain overcame the English pairing 9-3.

In Group A, Scotland - whose team consists of Olympic champion Jennifer Dodds and silver medallist Bruce Mouat - made it back-to-back wins by defeating The Netherlands' Vanessa Tonoli and Wouter Gösgens 7-4.

Canada's Sochi 2014 gold medallist Jennifer Jones and Brent Laing suffered their first defeat 7-4 to Estonia's Marie Kaldvee and Harri Lill, and Australia's Tahli Gill and Dean Hewitt lost 9-3 to Czech Republic's Julie Zelingrová and Vít Chabičovský.

Hosts South Korea, represented by Kim Ji-yoon and Jeong Byeong-jin, lost 9-6 to Denmark's Jasmin Lander and Henrik Holtermann, while Hungary's Linda Joó and Lőrinc Tatár remain without a win after going down 8-4 to Italy's Stefania Constantini and Sebastiano Arman.

The World Mixed Doubles Curling Championship is due to continue tomorrow, with group matches concluding on Thursday (April 27).