Mikaela Mayer

Mikaela Joslin Mayer (born July 4, 1990) is an American professional boxer. She is 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.

Amateur career
Mayer competed internationally as part of Team USA in the women's 60 kg category at the 2016 Rio Summer Olympics. She defeated Jennifer Chieng in the Round of 16 before being eliminated in the quarterfinal by Russian Anastasia Belyakova, who took a majority decision.

Amateur accolades

 * 2016 AIBA Americas Qualifier: Gold Medalist, Lightweight 60 kg (132 lb)
 * 2016 Olympic Trials Champion
 * 2015 USA Boxing National Champion 60 kg (132 lb)
 * 2014 USA Boxing National Champion 60 kg (132 lb)
 * 2012 AIBA Women's World Boxing Championships: Bronze Medalist, Light welterweight 64 kg (141 lb)
 * 2012 AMBC Continental Championships: Gold Medalist 64 kg (141 lb)
 * 2012 USA Boxing National Champion 64 kg (141 lb)
 * 2012 U.S. Olympic Team Trials: Runner-Up 60 kg (132 lb)
 * 2011 National Golden Gloves: Champion 60 kg (132 lb)

Professional career
After signing a promotional deal with Top Rank, Mayer made her professional debut on 5 August 2017, defeating Widnelly Figueroa by first-round knockout.

Mayer beat Ewa Brodnicka by unanimous decision to win the WBO female super-featherweight World title at the MGM Grand in Las Vegas on 31 October 2020. Her Polish opponent had been reigning champion but was stripped of the belt after failing to make the 130-pound weight limit.

On 5 November 2021, she took on IBF female super-featherweight World champion Maïva Hamadouche in a contest that saw both women's titles and the inaugural Ring female super-featherweight belt on the line. Mayer prevailed by unanimous decision.

Seeking to further unify the division, Mayer faced WBC and IBO champion Alycia Baumgardner in London, England, on 15 October 2022. She lost via split decision with judges John Latham and Steve Gray making Baumgardner the winner, both scoring the fight 96-95, while Terry O’Connor gave it to Mayer 97-93.

Mayer switched to lightweight for her next outing where she was scheduled to face Christina Linardatou on 15 April 2023, but the Greek boxer failed her pre-fight medical. Sweden's Lucy Wildheart stepped in as a last-minute replacement with Mayer winning by unanimous decision to became the interim WBC female lightweight World champion.

Another change in weight division saw Mayer challenge IBF female welterweight World champion Natasha Jonas in Liverpool, England, on 20 January 2024. After a closely fought contest, it was the English boxer who came out on top winning by split decision with judge Diana Drews Milano scoring the fight for Mayer 97-93 but Frank Lombardi (96-94) and Michael Alexander (96-95) giving it to Jonas.

Personal life
Between 2003 and 2005, Mayer played bass in heavy metal band Lia-Fail, which also included Nita Strauss.