(Seattle, WA)  --  The Mariners begin a four-game home series with the Twins tonight.  Erik Swanson will start for the Mariners, while Michael Pineda takes the mound Minnesota.  The M's are 22-and-23, seven-and-a- games behind the first-place Astros in the AL West.  The Twins lead the AL Central at 27-and-15.