Has Christina Hammer ever held the WBO female super-middleweight title?
No, never
Yes, in 2013
Yes, in 2015
Yes, in 2017
Answer
Yes, Christina Hammer has held the WBO female super-middleweight title. She won the title in 2013 by defeating Alicia Napoleon-Garcia by unanimous decision. Hammer successfully defended the title four times before losing it to Claressa Shields in 2018.
Punching Through Boundaries: The Christina Hammer Quiz