Latvia's Andris Bremanis and Santa Blumberga made it five wins out of five in Group A after beating Brazil's Marcio Cerquinho and Anne Shibuya 11-3 and Finland's Tomi Rantamaki and Oona Kauste 10-7.

In Group D, Czech Republic's Tomas Paul and Zuzana Hajkova overcame England's Ben and Anna Fowler 6-4 and hosts Canada's Reid Carruthers and Joanne Courtney 7-5 to extend their winning streak to four matches.

Scotland lead the way in Group B on three wins from as many outings thanks to an 8-5 success over Ireland today.

As for Group C, South Korea are the front-runners having moved onto four victories out of four with a 9-3 triumph at the expense of last year's runners-up China.

Undefeated Group E leaders Switzerland were not in action today as Spain and defending champions Russia made up some ground.

Both nations improved their win-loss records to 2-1 as Spain beat Slovenia 6-5 and Russia defeated Romania 13-2.

The only other unbeaten team in the competition are 2016 bronze medallists the United States, who thrashed Germany 10-1 to sit level with Czech Republic at the top of Group D.

The full list of teams due to compete at the Pyeongchang 2018 Winter Olympic Games, where mixed doubles curling is making its debut on the programme, will be known after the conclusion of the event in Alberta.

A total of 16 teams, spread across eight countries, are set to participate at the Winter Olympics in the South Korean resort.

The seven Member Associations with the most points from 2016 and 2017 will gain qualification to the Games and join hosts South Korea, who are guaranteed a place in the mixed doubles curling event.

Round-robin action in Lethbridge is due to continue tomorrow.