Former two-time super middleweight world champion Byron “Slama from Bama” Mitchell has replaced Alejandro “Naco” Berrio, who was unable to leave Colombia with visa issues, as light heavyweight sensation Beibut Shumenov’s opponent on Saturday night. The pair meet in the main event on an all-star card, outdoors at Khadkimukan Stadium in Shumenov’s hometown of Chimkent,…