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The Diamondbacks reinstated Frias (shoulder) from the injured list Thursday and optioned him to Triple-A Reno.
Frias moved his rehab assignment from rookie ball to Triple-A on Tuesday, and he will officially remain with the Aces now that he's made a full recovery from the shoulder inflammation that sent him onto the IL in April. The 26-year-old right-hander allowed seven earned runs in 6.1 innings during his time in the majors before getting injured, and he would likely need to show improvement at Reno before the D-backs consider bringing him back into their bullpen.
