Kamenjašević started wrestling at the age of 9 in wrestling club "Metalac" in Zagreb.[2] He attended elementary school in Klinča Sela and Sport Gymnasium in Zagreb. Currently, he studies at the Faculty of Kinesiology of the University of Zagreb.[3]
Career
In 2016, he won silver medal at the European U-23 Championships in Bulgaria in 71 kg category. Following year, he won silver medal at the same competition in Hungary, but this time in 75 kg category, as well as fifth place in Turkey in 2018 in 77 kg category.[4]