Diaz fired a scoreless seventh inning in Wednesday's 5-1 loss to the Nationals, issuing two walks and recording a strikeout.
The young reliever put together his second straight scoreless outing since being jettisoned from the closer's role, although Wednesday's performance featured some of the control problems that derailed the May 15 appearance which led to his demotion. Diaz had only issued five walks over 10.1 innings in April, but has already handed out seven free passes in 8.1 frames across nine May appearances. Following his previous outing on May 19, manager Scott Servais had previously hinted that he would re-evaluate the 23-year-old's suitability for the closer's role after his next appearance; therefore, it remains to be seen if Wednesday's effort was enough to vault Diaz back into the ninth-inning job.