Shields is an American professional boxer, multi-weight class world champion and Olympic gold medalist.
Taylor is an Irish Olympic gold medalist and existing world champion in the lightest weight class.
Amanda Serrano is a world champion in seven divisions with a 40-1-1 career record.
McCaskill is a unified welterweight world champion and former undisputed super lightweight world champion.
Super featherweight world champion by the WBC and IBO with a 12-0-1 record.
Persoon is a Belgian professional boxer who won the IBF female lightweight title in 2012 and the WBC female lightweight title from 2014 to June 2019.
Former undisputed welterweight world champion with a record of 36-2-0.
WBA minimumweight world champion with a record of 20-0-0.
Former world super featherweight champion of the WBC and the current WBA featherweight champion.
Olympic bronze medalist at flyweight with a 9-1-0 record.