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Klassen (concussion) was activated from Double-A Rocket City's 7-day injured list Sunday.

Klassen suffered a concussion when he was hit in the head by a line drive during his May 11 start. The 23-year-old was briefly hospitalized but has since been cleared to return, and he'll rejoin the rotation Sunday. Klassen owns a 4.97 ERA and 1.34 WHIP in 29 innings through his first seven starts with Rocket City.

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