Claressa Shields and Savannah Marshall, who boxed as amateurs and had an incredible undisputed world title bout as professionals, are fierce rivals.
Marshall(13-1, 10KOs) has been calling for a rematch with Shields(14-0, 2KOs) a 28-year old American professional boxer even though she lost by unanimous decision. While both have established themselves as professional boxers and intend to carry on with their individual boxing careers, they have also signed with PFL, an MMA promotion.
