Belocian won the 110 metre hurdles bronze medal at the 2011 World Youth Championships in Athletics, in a personal best of 13.51 seconds. He won the 110 metre hurdles gold medal at the 2014 World Junior Championships in a world junior record time of 12.99 seconds. Belocian withdrew from the 2015 World Championships in Athletics because of a thigh injury sustained in mid July 2015. Belocian was disqualified due to a false start in the 2016 Summer Olympics.