He born in Maribor, Prezelj represented Slovenia at the 2004, 2008 and 2012 Summer Olympics. His best result was at the 2008 Olympics where he finished 12th in the high jump. His father Dušan, who competed in the decathlon, had a high jump personal best of 2.15 m (1976) and his mother Stanka Lovše - Prezelj was a two-time Yugoslavian high jump champion with a personal best of 1.86 m (1981).