Lockwood's national representative debut was in 2009 when he was selected in the Australian U23 men's eight who contested the World Rowing U23 Championships in Racice and placed fourth. In 2010 he contested two World Rowing Cups in Europe in a coxless four and in the senior eight before again being selected for the World Rowing U23 Championships in Brest where he rowed in the coxless four that took the bronze medal. That same year he was in the bow seat of the Australian men's eight that won bronze at the senior 2010 World Championships. At the 2011 World Championships, he won silver in the men's coxed pair with James Chapman and David Webster as cox.
