Kammala jumlar da ke gaba: Korkmaz ya kasance memba na 'yan wasan matasa na Turkiyya. Tare da 'yan wasan matasa na Turkiyya, ya taka leda a: 2013 FIBA Turai Under-16 Championship, wanda ya jagoranci a zira kwallaye, 2014 FIBA Turai Under-18 Championship, inda ya lashe lambar zinare, 2015 FIBA Turai Under-18 Championship, inda ya lashe lambar azurfa kuma an kira shi zuwa ga All-Tournament Team, kuma a
2015 FIBA Under-19 gasar cin kofin duniya, inda ya lashe lambar tagulla kuma an kira shi zuwa All-Tournament Team.