Mezue ahịrịokwu na-esonụ: Roberts nwere ihe ịga nke ọma na mmetụta dị ukwuu n'ọrụ ntorobịa maka ndị otu mba Australia. Roberts mere egwuregwu mba ụwa mbụ ya na 2009 FIBA Oceania Under-16 Championship na Brisbane, Australia, ebe ọ gara Gold wee nweta ebe Australia nọ na mmeghe Under-17 World Championship n'afọ na-eso ya. Roberts ga-aga n'ihu na-anọchite anya Australia na FIBA World Championship na France ebe Australia nọ na asaa. Na asọmpi a, Roberts nwetara akara 16.1 n'egwuregwu ọ bụla. O mechara bụrụ onye nnọchi anya ndị Gems na
2011 FIBA Under-19 World Championship na Chile. N'asọmpi a, ọ bụ onye kachasị agba bọọlụ n'otu egwuregwu ọ bụla, na-agba bọọlụ 41 megide Japan. N'agbanyeghi na ha nwetara akara 15.9 n'otu egwuregwu na otu egwuregwu Australia siri ike, ndị otu ahụ agbagharala ọla nchara, na-etinye nke anọ.