They lead Group B after a 10-8 victory over Norway.

The key moment came in the eighth end after a power play yielded three points although their performance failed to satisfy them.

"We are not very happy, we had lots of mistakes," Yasumasa said.

"We have three games left and we focus on the next round-robin session and we don’t think about the semi-final yet."

It was a first defeat of the competition for Norway’s Martine Roenning and Mathias Braenden but they remain second overall with five victories.

The United States pair Cory Thiesse and Korey Dropkin are in equal second, after recording a 7-2 victory over England, who remain bottom of the group without a single victory to their name.

Switzerland are equal fourth, with their 7-5 win over Austria their fourth of the tournament.

Turkey beat Spain 10-4 to remain in equal fourth.

Meanwhile there was relief for Germany who beat Sweden to record their first win of the competition after five defeats.

In Group A Canada’s Jennifer Jones and Brett Laing beat Czech Republic 8-3 for their fifth win in six matches to lead the standings.

Scotland’s Jennifer Dodds and Bruce Mouat had a slender one point advantage over Estonia’s Marie Kaldvee and Harri Lill after six ends, but a stone in each of the last two gave the Estonians victory to move them equal first in the standings with just a single defeat in their six matches.

Scotland are in equal second along with Australia’s Tahli Gill and Dean Hewitt who surged through with four stones in the final end to beat host nation South Korea’s Kim Jiyoon and Jeong Byeongjin 10-7.

Italy are fifth after an 8-6 victory over the Netherlands despite a late fightback by the Dutch.

Action in Group A begins day five with leaders Canada opening against Denmark.

Estonia’s match against Australia could help clarify the situation in the places below.

Round-robin play continues until the knockout phase begins on Friday (April 28).