 Hebblewhite made his Australian representative debut in 2001 in a junior coxless four which competed at the 2001 Junior World Rowing Championships in Duisburg and rowed to a seventh placing..In 2003 he was selected to an U23 lightweight quad scull which raced to a seventh place at the World Rowing Cup III in Lucerne before contesting the 2003 U23 World Rowing Championships in Belgrade where they placed fourth.In 2004 Hebblewhite stepped up to the Australian senior lightweight squad and into the lightweight eight which was crewed by five Tasmanian rowers.