(Houston, TX)  --  Gerrit Cole struck out 15 over eight innings and Yordan Alvarez drove in six runs as the Astros demolished the Mariners 21-1 in Houston.   Shed Long had the M's only hit, a solo homer in the fourth.  Felix Hernandez gave up 11 runs in two-plus innings to take the loss.  Seattle falls to 58-and-86.  The Mariners will host the Reds tomorrow.