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McCarthy was optioned Monday to Triple-A Reno, Theo Mackie of The Arizona Republic reports.

It's the second demotion of the year for McCarthy, who has racked up 26 stolen bases but carries a rough .245/.325/.331 batting line across 291 plate appearances. Kyle Lewis will fill his spot on the Diamondbacks' major-league roster ahead of Monday's series opener at Coors Field in Colorado.

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