Ah-Nau was a member of the Australia Under 20 team that competed in the 2010 IRB Junior World Championship.
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In 2010, he was one of many referees to referee a match in the 2010 IRB Junior World Championship, where he would referee the 3rd place play-off between England under 20's and South Africa under 20's.
He was once again on the IRB panel for the 2010 IRB Junior World Championship refereeing several matches including the final between Australia under-20's and New Zealand under-20's.