Mikaela Joslin Mayer is an American professional boxer, who has held WBO welterweight title since September 2024. She is also a former unified female super-featherweight world champion, having held the WBO and the IBF titles simultaneously. She has also held the interim WBC female lightweight world title. As an amateur, she won a bronze medal at the 2012 World Championships and competed for the U.S. at the 2016 Olympics.
World champion Mikaela Mayer outpoints Briton Sandy Ryan for the second time to defend her WBO welterweight title in Las Vegas.
