Duvall was recalled from Triple-A Fresno on Sunday, Alex Pavlovic of the San Jose Mercury News reports. Recurring concussion symptoms forced Brandon Belt back to the 7-day DL, and Duvall will up for the time being to help out around the corner infield. He's starting at first base and batting sixth Sunday against Royals lefty Danny Duffy, but will likely sit behind the likes of Mike Morse and Travis Ishikawa most days.