(Seattle, WA)  --  The Seattle Mariners remain in first place in the AL West after clobbering Houston, 11-1.  Robinson Cano led the Mariners' onslaught last night with six RBI, including a grand slam home run in the seventh.  Nathan Karns allowed no runs on two hits and struck out six for Seattle.  The Mariners and Astros will wrap up their series tonight at Safeco Field.