Mezue ahịrịokwu na-esonụ: N'oge okpomọkụ nke 2015, Charalampopoulos merụrụ ahụ ụkwụ aka nri n'egwuregwu enyi na enyi megide USA, ndị dọkịta kwuru na mbụ na ọ ga-esiri ya ike igwu egwu na
2015 FIBA Under-19 World cup. N'agbanyeghi mmerụ ahụ, Charalampopoulos nwere ike igwu egwu n'asọmpi ahụ, wee nweta akara 21 megide US na ọkara ikpeazu nke asọmpi ahụ. Gris tufuru egwuregwu ọkara ikpeazụ megide US, Charalampopoulos merụkwara ahụ ọzọ na egwuregwu nke atọ, megide Turkey, nke Gris tufuru, ebe ha kwụsịrị n'ọnọdụ nke anọ.