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The Rockies optioned Herrera to Triple-A Albuquerque on Sunday, Patrick Lyons of JustBaseball.com reports.

The 21-year-old lefty was added to Colorado's 40-man roster in November but was never a likely bet to make the Opening Day roster. Herrera spent most of last season with Double-A Hartford, where he had a 3.69 ERA, 1.30 WHIP and 70:19 K:BB across 46.1 innings.

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