The Orioles took a two-run lead into the bottom of the eighth, but Eric Hosmer tied it with his two-run homer and the Royals came through in the ninth for their second victory in a row over the Orioles.
Wei-Yin Chen singled with one out in the Kansas City eighth before Hosmer hit his home run to right-center, his second of the game and 11th of the season. Hosmer also homered in the first inning.
Kansas City's ninth-inning run came off Darren O'Day (5-1).
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