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Liberatore exited the second game of Thursday's doubleheader with the Cardinals' head athletic trainer, Derrick Goold of the St. Louis Post-Dispatch reports

Liberatore struggled across four innings prior to his exit, allowing six earned runs on eight hits and one walk. The exact nature of the injury is unclear, but his velocity dipped to 89.5 mph against the final batter he faced, per John Denton of MLB.com.

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