Kalajdzic lost a highly controversial decision to Marcus Browne 16 April 2016 fight for the WBC United States title, which broke his undefeated streak.
[3] His three-seconds knockout of Fabio Garrido on 13 November 2015 was met with criticism.
[1] Kalajdzic was scheduled to face David Morell for the vacant WBA "Regular" light heavyweight title at BMO Stadium in Los Angeles on August 3, 2024.
[6] Born in Zenica, SR Bosnia and Herzegovina (at the time SFR Yugoslavia), his family fled the Bosnian War in 1992 first to Bijeljina in Republika Srpska and then moved to Čačak in Serbia, and after 7 years as refugees they moved to the United States,[3] to Saint Petersburg, Florida in 1998.
He is a devout believer in Jesus Christ and he wears tattoos of Eastern Orthodox iconography.