Oakland Athletics outfielder/designated hitter Brent Rooker was placed on the 10-day injured list Thursday due to an injury that he sustained on Sunday. Rooker is dealing with a costochondral rib cartilage injury. He was hurt in the game against the Detroit Tigers on a checked swing and has missed the last three games, including Thursday's 1-0 road win over the Texas Rangers. Rooker, 29, is batting .200 with two homers, five RBIs and 16 strikeouts in 30 at-bats over eight games this season. Last season, Rooker was a surprise power source with 30 homers and 69 RBIs in 137 games. He batted .246 and made the American League All-Star roster. Oakland recalled utility man Max Schuemann from Triple-A Las Vegas to fill the roster opening. The 26-year-old was batting .174 in six games at…