From WBC:
HAMMER VOWS TO SCUPPER NELSON (VIDEO)
World Boxing Council female middleweight champion Christina Hammer (22-0, 10 KOs) defends her Green and Gold belt against tough former world champion Tori Nelson (17-1-3, 2 KOs) on June 22 in Detroit, Michigan.
Hammer comes from defending her crown, last November, knocking out Gifty Amanua Ankrah from Ghana. While in her last fight Tori Nelson lost against the WBC super middleweight champion Claressa Shields.