Answer
Jermall Charlo has unified titles in two different weight classes. He is the current WBC middleweight champion and has previously held the IBF junior middleweight title. In 2016, Charlo defeated Julian Williams to win the IBF junior middleweight title. He then defended the title three times before moving up to middleweight in 2018. In his first fight at middleweight, Charlo defeated Daniel Jacobs to win the WBC middleweight title.