Muamer Hukić, best known as Marco Huck, is a Bosniak, nationalized German professional boxer. He held the WBO cruiserweight title from 2009 to 2015, and is the joint-longest reigning cruiserweight world champion of all time, having made thirteen consecutive successful defenses, a division record shared with Johnny Nelson. Huck also held the IBO cruiserweight title from 2016 to 2017, the European cruiserweight title from 2008 to 2009, and has challenged once for the WBA (Regular) heavyweight title in 2012.

The World Boxing Organization (WBO) is an organization which sanctions professional boxing bouts. It is recognized by the International Boxing Hall of Fame (IBHOF) as one of the four major world championship groups, alongside the World Boxing Association (WBA), World Boxing Council (WBC), and International Boxing Federation (IBF). The WBO's headquarters are located in San Juan, Puerto Rico.