(Seattle, WA)  --  The Mariners are getting ready to host Oakland after losing to the Houston Astros, 5-2.  Starting pitcher Hisashi Iwakuma had a rough night, allowing four runs on six hits over four-plus innings.  Mike Zunino doubled in the Mariners' two runs in the second inning.  Seattle, which is still a half-game back in the race for the second AL Wild Card slot, will begin a three-game series with Oakland tomorrow night at Safeco Field.