Luke Saunders and Marlee Powers opened the Canadian Mixed Doubles Curling Championship on Sunday with a 6-5 Pool B victory at the Aitken Centre. In other Pool B games, Pierre Lanoue and Kelly Tremblay of Boucherville, Que., defeated Nancy Martin and Steve Laycock of Martensville, Sask., 8-4; Jackie McCormick and Trevor Bonot of Stratton, Ont., edged Jim and Jaelyn Cotter of Vernon