Mercer left Saturday's game against the Reds with forearm discomfort after being struck by a batted ball.

The injury didn't appear serious -- though he was struck by 102-mph groundball -- and Mercer's removal was described as precautionary. In fact, he remained in the game and batted twice before leaving. With the year nearly over, however, even a one-game absence would spell the end of Mercer's season.

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