 Complete the following phrase:  Having impressed for the Irish midlands team, Masterson was called up for the Irish under-18 club team a year early in 2010. He captained the side a year later. Despite his record with the under-18 side, injury impeded Masterson when the time came to step up to the Irish under-20 team. Masterson made one appearance in the 2013 Six Nations Under 20s Championship, playing against Scotland. After being left out of the Irish squad for the 