The 26-year-old Walker was promoted to Triple-A Iowa late last month, where he's hit safely in nine of his first 10 games there.
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Through April 20, Micah Hoffpauir was batting over .400 and was the Pacific Coast League leader in RBIs. A first baseman all throughout his minor league career, the 27-year-old has gotten some starts this season in the outfield.
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