Reading Fightin Phils
Mendonca was selected by the Oakland Athletics in the Triple-A phase of the 2012 Rule 5 draft. Oakland released Mendonca in April 2013, without him appearing in a game for their organization. He signed with the Philadelphia Phillies on a minor league deal on May 11, and played for the Reading Fightin Phils until he was released on June 6, 2013.