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Diaz allowed two earned runs on five walks over one inning of relief Sunday in his appearance for Triple-A Reno.

Diaz made his second appearance for Reno since rejoining the squad following a stay at the Diamondbacks' facility in Arizona to work on command issues. Judging by Sunday's effort, the right-hander's wayward command was not solved. The 24-year-old had previously started in each of his first eight appearances of the season with Reno, but both of his last two outings have come out of the bullpen. Arizona might not have completely closed the door on developing Diaz as a starter, but he looks like he'll first need to find some success in a relief role before he's considered for a spot in the Reno rotation.

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