Valencia is out of the lineup Sunday against the Mariners, John Hickey of the Oakland Tribune reports.
Valencia will rest for the first time this season after going 5-for-21 (.238) at the plate over his first six contests. While he's been a platoon player for most of his career, it looks as though the Athletics are fully comfortable with Valencia in an everyday role, as he opened the season in the lineup against three consecutive lefty starters. He'll give way to Chris Coghlan at third base Sunday.