(Houston, TX)  --  After a quick two-game stop in Chicago, the Mariners will head south to take on the Astros for the first of four games in Houston tomorrow night.  Marco Gonzales will take the ball for Scott Servais' club.  He's 14-and-11 with a 4.30 ERA.  Wade Miley, whose 13-and-4, will pitch for the division-leading Astros.  The M's will trot out four-straight southpaws, as Tommy Milone, Yusei Kikuchi and Justus Sheffield are scheduled to pitch the final three games of the set.