Whakaotihia te rerenga e whai ake nei: I wikitoria a Barnes i te mētara koura me te United States i te 2017 FIBA Under-16 Americas Championship i Formosa, Argentina i muri i te toharite 9.8 tohu, 3.2 rebounds me 2.4 tahae mo ia keemu. I roto i te wikitoria haurua-mutunga ki Argentina, i arahi ia i nga kaute katoa me nga tohu 20 me nga tahae e ono i a ia e pakaru ana i te rekoata o Amerika i raro i te 16 mo te ōrau tuku koreutu ma te kopere 8-o-8 mai i te raina tuku koreutu. I te 2018 FIBA Under-17 World Cup i Argentina, i toharite a Barnes i te 9.5 tohu me te 5.8 rebounds ia keemu ka mau i tetahi atu mētara koura. He toharite 9.7 ngā tohu, 4.9 rebounds me 2.7 āwhina ia kēmu i te
2019 FIBA Under-19 World Cup i Heraklion, Kariki, i reira i wini ai ia i tana mētara koura tuatoru me te United States.