Royals 9, Athletics 8 (12): Salvador Perez stroked the game-winning single to cap a two-run 12th inning as host Kansas City stunned Oakland in the American League wild-card game.

Alberto Callaspo delivered a go-ahead single in the 12th inning for the Athletics but the Royals tied the score in the bottom of the frame when Eric Hosmer tripled to left-center field off loser Dan Otero and scored on Christian Colon’s high chopper. Colon stole second and easily scored when Perez sent a soft liner off Jason Hammel past third baseman Josh Donaldson into left field.

Jason Frasor recorded the final two outs for the victory as Kansas City advances into an AL Division Series against the Los Angeles Angels, a matchup that begins Thursday at Angel Stadium. Oakland was led by Brandon Moss, who hit two homers and drove in five runs.

The Royals were three outs from losing in the ninth before pushing across the tying run off Oakland closer Sean Doolittle when Nori Aoki hit a sacrifice fly to right. The Athletics went ahead in the 12th when Josh Reddick walked against Brandon Finnegan, was sacrificed to second and moved to third on Frasor’s wild pitch before scoring on Callaspo’s sharp single to left field.

Oakland’s Sam Fuld had a broken-bat single to right and Donaldson walked to start the sixth before Kansas City manager Ned Yost pulled starter James Shields in favor of rookie Yordano Ventura. Moss greeted Ventura with a three-run shot to center and Derek Norris and Coco Crisp added RBIs single later in the inning to give Oakland a 7-3 lead before the Royals got within one in the eighth on run-scoring singles from Lorenzo Cain and Billy Butler, and a wild pitch from Athletics reliever Luke Gregerson.

Moss smacked a two-run homer in the first inning off Shields before Kansas City struck once in the bottom of the inning on Butler’s single. Cain delivered a game-tying double inside the left-field line in the third and scored when Hosmer followed with a run-scoring single to give the Royals a 3-2 lead.

GAME NOTEBOOK: Playing their first playoff game since winning the 1985 World Series, the Royals tied a postseason record with seven stolen bases, joining the 1907 Chicago Cubs (World Series) and 1975 Cincinnati Reds (National League Championship Series). … Moss is the first Athletics player to hit two homers in a postseason game since Milton Bradley in the 2006 AL Championship Series. … Kansas City starter James Shields was charged with four runs and five hits in five-plus innings, while Oakland’s Jon Lester allowed six runs and eight hits in 7 1/3 innings. … Athletics C Geovany Soto (thumb) departed in the third inning and CF Coco Crisp (hamstring) exited prior to the bottom of the 11th.