Walker, 26, is slashing .306/.381/.631 with 25 extra-base hits across 181 plate appearances with Triple-A Reno this season.

Walker is doing a tour of Triple-A for the fourth consecutive season and is making a compelling case for a spot on the Pacific Coast League All-Star team. His 46 RBI on the season are the most in the minors, while his 12 homers are tied for the top mark across all levels. That sort of production would normally put Walker on the radar for a promotion to the big leagues, but the Diamondbacks' decision to drop him from the 40-man roster coming out of spring training may make his road to the majors more difficult.

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