Sweden rallied from a 4-2 deficit to defeat China 6-5, scoring in an extra end to finish off the contest.
China came back in the evening to defeat Norway 7-5 and concluded the day with a 5-1 record, the same as that achieved by Sweden and Britain.
The win over China came in Sweden's only game of the day and Britain also played just once, getting past Denmark 8-6.
Canada was alone in fourth place at 4-2, having recorded its third straight win with a 4-2 decision over Norway.
The Norwegians have a 3-3 record while Denmark, Russia and the United States are all 2-4.
The top four teams at the end of the nine-game, round-robin tournament advance to the semifinals.