Mikaela Joslin Mayer is an American professional boxer who has held world championships in three weight classes and is the current unified world female super-welterweight champion since October 2025, holding the WBA, WBC and WBO titles. She has also held the WBO welterweight title since September 2024.
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Mikaela Joslin Mayer is an American professional boxer who has held world championships in three weight classes and is the current unified world female super-welterweight champion since October 2025, holding the WBA, WBC and WBO titles. She has also held the WBO welterweight title since September 2024. Mayer is a former unified female super-featherweight world champion, having held the WBO and IBF titles simultaneously. She has also held the interim WBC female lightweight title. As an amateur, she won a bronze medal at the 2012 World Championships and competed for the U.S. at the 2016 Olympics.
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