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The Diamondbacks optioned McGough to Triple-A Reno on Sunday, Alex Weiner of ArizonaSports.com reports.
The right-hander was called up by Arizona on Friday and will return to Reno after he delivered two scoreless frames during Saturday's contest. McGough has a 6.83 ERA, 1.62 WHIP and 20:19 K:BB across 29 major-league innings this year.
