At Mesa, Arizona, Matt Szczur keyed a three-run second inning for the World Series champions and Charcer Burks hit a solo homer in front of 14,929 fans.
Burks also had a diving catch in left field with two on and one out in the eighth inning.
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SIGN UP HERE Matt Joyce hit a solo home run in his first game with Oakland and Matt Chapman tied it 3-all with a two-run drive in the fourth. Rajai Davis, who hit a tying home run off Aroldis Chapman in the eighth inning of last year's World Series Game 7, opened the game for the Athletics with a walk, then stole second and third but was stranded when Stephen Vogt flied out.
A's starter Jesse Hahn allowed three runs, all in the second, including a two-run single by Szczur that deflected off the pitcher's glove.