Walston has joined the Diamondbacks' taxi squad and is expected to be called up from Triple-A Reno to start Sunday's game against the Marlins, Alex Weiner of ArizonaSports.com reports.
The Diamondbacks haven't officially announced their pitching plans for Sunday, but Walston's presence in the clubhouse suggests that he'll be the choice to either start or work as a bulk reliever in the series finale versus Miami. The 22-year-old southpaw allowed two earned runs in 3.2 innings during his MLB debut May 1 against the Dodgers, and he has since posted a 4.20 ERA and 1.40 WHIP across three appearances upon being sent back down to Triple-A.
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