Marlins left fielder Logan Morrison has filed a grievance against his team for what he believes was a wrongful demotion last month. Morrison, 24, was sent to the minors Aug. 13, shortly after hitting third in the batting order in a game that night. The next day, Marlins president of baseball operations Larry Beinfest told reporters Morrison needed to learn more about "being a major leaguer." "I'm doing this because I'm standing up for what's right," Morrison said. "If I thought it was because of my performance on the field, then I wouldn't be filing a grievance."