The Mariners optioned Diaz to Triple-A Tacoma on Wednesday.

EDGE Analysis

Diaz made his one appearance for Seattle on Tuesday. He allowed no runs on one hit with a strikeout in 1.1 innings. The southpaw has made the bulk of his appearances for Tacoma as a starter and figured to get a shot at securing a rotation spot in place of the injured George Kirby (shoulder). After just one relief appearance, he will return to Tacoma. In a corresponding move, Luis F. Castillo is expected to be promoted from Triple-A Tacoma to make his first career start Friday.