He was added to the Marlins ' 40 man roster after the 2011 season to protect him from the Rule 5 draft .
The Marlins assigned Mattison to the Arizona Fall League after the 2011 regular season , where he won the Dernell Stenson Sportsmanship Award .
Mattison was added to the Marlins ' 40 man roster after the 2011 season to protect him from the Rule 5 draft .
The Marlins assigned Mattison to the Arizona Fall League after the 2011 regular season , where he won the Dernell Stenson Sportsmanship Award .