Auburn Doubledays
Core was originally drafted by the Toronto Blue Jays in 2003. He began his career with the short season Class A Auburn Doubledays, later playing for the Class A Lansing Lugnuts and the Advanced-A Dunedin Blue Jays. He was released by Toronto during the 2007 season, signing with the Kansas City T-Bones of the Northern League before joining the Brother Elephants.