On May 21, 2013, USA Basketball announced the roster of 24 players, including Okafor, who had accepted invitations to the June 14–19, 2013, USA Basketball Men's U19 World Cup team training camp. The camp was used to select the 12-man team for the June 27 – July 7, 2013 FIBA Under-19 World Championship in Czech Republic. Okafor made the final roster that was announced on June 18. The team won the gold medal, and Okafor made the All-Tournament team, along with teammate and tournament MVP Gordon. He led the tournament with 77% field goal percentage, and he was the only player on the All-Tournament Team who would return to high school. However, coaches Billy Donovan and Shaka Smart told him his weak link was his conditioning.