Whakaoti i te rerenga e whai ake nei: I te Mei 21, 2013, i whakaatuhia e te USA Basketball te raarangi o nga kaitakaro 24, tae atu ki a Okafor, i whakaae ki nga tono ki te puni whakangungu a te kapa USA Basketball Men's U19 World Cup i te Hune 14<unk>19, 2013. I whakamahia te puni hei whiriwhiri i te kapa 12 tangata mo te 27 o Pipiri <unk> Hōngongoi 7,
2013 FIBA Under-19 World Championship i te Czech Republic. I uru a Okafor ki te raarangi whakamutunga i panuitia i te Pipiri 18. I wikitoria te kapa i te mētara koura, a, i uru a Okafor ki te kapa katoa o te whakataetae, me tana hoa kapa me te MVP o te whakataetae a Gordon. I arahi ia i te whakataetae me te 77% ōrau o te whaainga whaainga, a ko ia anake te kaitakaro i te kapa o te whakataetae katoa ka hoki ki te kura tuarua. Heoi anō, i kī atu ngā kaiako a Billy Donovan rāua ko Shaka Smart ki a ia ko tana hononga ngoikore, ko tōna āhua.