Montgomery, acquired from the Rays in the Erasmo Ramirez trade just before the season opener, threw six innings of one-run ball and is now 1-1 with a 1.89 ERA in three starts since being called up from Triple-A Tacoma.
The former Royals first-round Draft pick has now pitched six or more innings and allowed two runs or fewer against the Yankees, Rays and now Astros. He joins Bob Stoddard (1981) as the only Mariners pitchers to accomplish that feat in his first three career starts.
"It's been fun," Montgomery, who turns 26 on July 1, said of his sudden arrival in the Majors after eight years in the Royals and Rays organizations.