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Walston was recently promoted from Low-A Visalia to High-A Hillsboro.
Walston was picked 26th overall by Arizona in 2019. He was a member of the club's taxi squad at times last season before starting this season at Visalia. The southpaw posted a 3.32 ERA while striking out 60 across 43.1 Low-A innings and will now look to carry that success with him to the High-A level.
