Canadian skips Brad Gushue and Matt Dunstone dropped their opening games Tuesday at the Grand Slam of Curling's Masters event.
Yannick Schwaller's Swiss side ran Gushue out of rocks in a 5-3 victory at the Sixteen Mile Sports Complex.
Norway's Magnus Ramsfjell scored a single in the eighth end for a 5-4 win over Dunstone.
At No. 2, Dunstone's Winnipeg-based rink is the top-ranked Canadian team on the year-to-date world rankings list. Sweden's Niklas Edin is No. 1 and Gushue, from St. John's, N.L., is third.
In other early games, Toronto's John Epping defeated Winnipeg's Reid Carruthers 7-3 and Scotland's Bruce Mouat dumped American Korey Dropkin 8-2.
Four draws are scheduled on the day. Play continues through Sunday.