Gennady Golovkin boxes.
Gennady Gennadyevich Golovkin ( Геннадий Геннадьевич Головкин born 8 April 1982 ) is a Kazakhstani professional boxer who currently holds the unified WBA ( Super ) , WBC , IBF , and IBO middleweight titles . Later that year he defeated Marco Antonio Rubio to add the WBC interim middleweight title to his collection , and defeated David Lemieux in 2015 to win the IBF middleweight title . The International Boxing Federation ( IBF ) is one of four major organizations recognized by the International Boxing Hall of Fame ( IBHOF ) which sanction world championship boxing bouts , alongside the World Boxing Association ( WBA ) , World Boxing Council ( WBC ) and World Boxing Organization ( WBO ) . The World Boxing Council ( WBC ) is one of four major organizations which sanction world championship boxing bouts , alongside the International Boxing Federation ( IBF ) , World Boxing Association ( WBA ) and World Boxing Organization ( WBO ) .