The Mariners finished off a sweep in their home series.  Seattle edged the Rockies 1-0 at T-Mobile Park.  Luis Castillo dominated on the mound, allowing just two hits and striking out nine over seven innings.  Paul Sewald notched his fourth save in relief.  Jarred Kelenic plated the game's lone run in the sixth inning.  The M's improved to 8-and-8.  Seattle starts a home series with the Milwaukee Brewers tonight and sends right-hander Chris Flexen to the hill.