Gennady Golovkin boxes.
The AIBA World Boxing Championships and the AIBA Women 's World Boxing Championships are biennial amateur boxing competitions organised by the International Boxing Association ( AIBA ) , which is the sport governing body . Gennady Golovkin . In his amateur career , Golovkin won a gold medal in the middleweight division at the 2003 World Championships . An interim championship is an alternate title that is awarded by the four major sanctioning bodies of professional boxing ( WBA , WBC , IBF , and WBO ) , and in other combat sports such as kickboxing and mixed martial arts . The Transnational Boxing Rankings Board ( TBRB ) is an all-volunteer initiative formed in October 2012 with the intention of providing professional boxing with authoritative top-ten rankings , identifying the singular world champion of every division by unbiased reasoning and common sense , and to insist on the sport 's reform .