Rasmus and Isabella Wrana of host Sweden handed Canada's Kadriana and Colton Lott their first loss at the world mixed doubles curling championship on Tuesday.

Sweden opened up a 4-1 lead midway through the game and held on for a 6-5 win over Canada in a battle for top spot in Group B at the 20-team tournament.

The Wrana siblings improved their record to 6-0, while the Lotts fell to 5-1.

Sweden scored one with the hammer in the opening end and followed with a steal of one in the second.

The Lotts, a husband-and-wife team from Gimli, Man., got one back in the third before Sweden scored a deuce in the fourth to open up its lead.

Canada responded to start the second half of the match with two in the fifth end, but a deuce from Sweden in the sixth proved to be too much to overcome.

The Lotts scored one in the seventh and had a steal of one in the eighth but couldn't close the gap.

Scottish duo gives Canadians a scare

Canada opened the day with a 12-5 win over Scotland.

The Lotts scored three in the second end and stole another in the third after the Scottish duo of Sophie Jackson and Duncan McFadzean opened with a single.

Later with Canada in control leading 6-2, Scotland applied some pressure by scoring three in the fifth end to cut the lead to one.

The Lotts fully extinguished the Scottish comeback with a score of six in the sixth.

Scotland fell to 2-3.

Canada faces China on Wednesday before ending the round robin with Thursday games against Australia and the United States.

Medal games being held on Saturday.