Defending champion Kerri Einarson is 7-0 in Pool A at the Scotties Tournament of Hearts after downing Alberta's Laura Walker 8-3 in Calgary.
Team Canada is a guaranteed a place in the eight-team championship pool.
Walker dropped to 4-3 but is a good bet to get past winless Yukon on Thursday.
Ontario's Rachel Homan improved to 6-1 with hard-fought 8-6 triumph over Mackenzie Zacharias' brilliant young team from Alberta (2-5).
Zacharias, the second wild-card team in the national championship, won't advance past Thursday.
In Pool B action, three Manitoba-based teams are in the mix to make the championship round. Manitoba representative Jennifer Jones is 4-2, Tracy Fleury of East St. Paul (Wild Card 2) if 4-3, while Beth Peterson of Winnipeg (Wild Card 3) is also 4-3.