 He lost to Belarusian Ali Shabanau in the round of 16 at the 2013 World Championships in Budapest, Hungary.He won the bronze medal at the 2014 European Championships in Vantaa, Finland.Demirtaş lost to Jumber Kvelashvili of Georgia in the round of 32 at the 2014 World Championships in Tashkent, Uzbekistan.