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Calhoun will undergo a right knee medial meniscectomy Wednesday to address a torn meniscus, Nick Piecoro of The Arizona Republic reports.

The 33-year-old has been battling inflammation in his right knee, and after undergoing an MRI on Tuesday that resulted in the torn meniscus being diagnosed, he'll quickly go under the knife. The Diamondbacks have yet to provide an official recovery timetable, but 4-to-6 weeks is a reasonable expectation until we know more. With that in mind, Calhoun likely will be sidelined for Opening Day, though the specifics may remain hazy until the team provides another update on his status.

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