Sam has been an integral part of the Crusaders squad since his debut in 2010. He impressed All Black selectors enough to also make his debut for the national side in 2010, scoring two tries in his first match against Ireland in New Plymouth. In 2011 he was selected into All Blacks World Cup Squad and started every game bar the first pool match. He is making a similar impact in the 2015 Rugby World Cup.
He was previously a member of the New Zealand Under 20 side that won the 2008 IRB Junior World Championship.