Rubuta ci gaba don wannan sakin layi - A ranar 21 ga Mayu, 2013, Kwallon Kwando na Amurka ya sanar da jerin 'yan wasa 24, gami da Okafor, waɗanda suka karɓi gayyata zuwa sansanin horon gasar cin kofin duniya na maza na Amurka na 14-19 ga Yuni, 2013. An yi amfani da sansanin don zaɓar ƙungiyar mutum 12 don 27 ga Yuni <unk> 7 ga Yuli, 2013 FIBA Under-19 World Championship
a Jamhuriyar Czech. Okafor ya sanya jerin sunayen karshe wanda aka sanar a ranar 18 ga Yuni. Tawagar ta lashe lambar zinare, kuma Okafor ya sanya tawagar All-Tournament, tare da abokin wasan da kuma gasar MVP Gordon. Ya jagoranci gasar tare da kashi 77% na filin wasan, kuma shi ne kawai dan wasan a cikin All-Tournament Team wanda zai koma makarantar sakandare. Koyaya, masu horarwa Billy Donovan da Shaka Smart sun gaya masa cewa raunin da yake da shi shine yanayin sa.