As a junior, Casey played in Prince Edward Island as the third on the Brett Gallant junior men's team. As a member of the team, Casey won 5 straight provincial junior championships from 2006 to 2010 inclusively. In 2007, they won a bronze medal at the Canada Winter Games. The team won the 2009 Canadian Junior Curling Championships and won a silver medal at the 2009 World Junior Curling Championships.