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Walker (oblique) participated in batting practice Tuesday, Alex Weiner of ArizonaSports.com reports.

After a few days of hitting off a pitching machine, Walker has now checked off another box in his hitting progression. Assuming he's able to get through another several rounds of BP without issue, he could potentially begin playing in simulated games over the weekend. It's unclear if he will require a rehab assignment before returning to the active roster.

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