Royals catcher John Buck was placed on the disabled list before Sunday's game with a slight herniated disk in his back. Catcher Brayan Pena, who was two for seven early in the season, was recalled from Class AAA.
Buck spent Saturday night and at least part of Sunday at an area hospital. Royals manager Trey Hillman said Buck felt "a tweak" in the back as he grabbed for his catching helmet in the dugout, then fell to his knees as he walked up the dugout steps to the on-deck circle.
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