Diaz fired a scoreless ninth inning in Monday's 6-2 win over the Tigers, issuing a walk and recording a strikeout.
The hard-throwing 23-year-old has now been deployed in non-save scenarios in back-to-back games, firing a scoreless inning in each. Manager Scott Servais seems intent on affording Diaz consistent work, with the goal of avoiding some of the inconsistency that plagued him earlier in the season and brought about a temporary demotion from the closer's role.