Kammala jumla mai zuwa: Mobley ya taka leda a Amurka a 2018 FIBA Under-17 World Cup a Argentina. A cikin wasanni bakwai, ya samu maki 9.3, 5.6 da kuma tallafi 2.6 a kowane wasa, yana taimakawa tawagarsa ta lashe lambar zinare. Mobley ya shiga Amurka don
2019 FIBA Under-19 World Cup a Heraklion, Girka, amma an iyakance shi da buga wasanni biyu da jimillar minti bakwai a gasar saboda ciwon baya. Tawagarsa ta lashe lambar zinare duk da rashin sa.