(Oakland, CA)  --  Jake Lamb's solo homer in the seventh snapped a 2-all tie as the A's dropped the Mariners 6-2 in Oakland.  Mark Canha added a two-run double in the frame and finished with four RBI for the A's.  Frankie Montas struck out 13 over six innings, but Yusmeiro Petit got the win.  The A's clinched the second seed in the AL playoffs and will face the White Sox in the first round.