Mammadov who won silver at the 2011 World Amateur Boxing Championships, losing to Oleksandr Usyk and gold at the 2011 European Amateur Boxing Championships. At the London 2012 Olympic Games Mammadov won a bronze medal after a controversial decision to award him a victory over Siarhei Karneyeu. He had already defeated Jai Opetaia but lost to Clemente Russo in the semi-final.