Drafted in the 10th round (286th overall) by the Arizona Diamondbacks in 2015 (signed for $154,600).
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A junior, Armstrong was a three-year starter for the Rebels who was more of a force defensively than offensively. He's an above-average athlete and thrower with a plus arm that helped him lead the Mountain West Conference with eight outfield assists. His swing isn't pretty, and he had his worst offensive season in 2015, hitting just .277/.387/.357.
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