# Mikaela Mayer

Mikaela Joslin Mayer (born July 4, 1990) 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.

## 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.

### Mayer vs. Jonas

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.

### WBO Welterweight Champion
#### Mayer vs. Ryan

Mayer was scheduled to challenge WBO welterweight champion Sandy Ryan in New York on September 27, 2024. She won the fight by majority decision. On the day of the fight, while leaving to the event, Ryan was hit by a tin of paint at her hotel. Two days after the fight Ryan demanded an immediate rematch in light of the paint incident and alleged threats against her and her support team.

#### Mayer vs. Ryan 2

Mayer is scheduled to make the first defense of her WBO welterweight title in a rematch against Sandy Ryan on March 29, 2025 in Las Vegas.

## Professional boxing record

| 22 fights | 20 wins | 2 losses |
| By knockout | 5 | 0 |
| By decision | 15 | 2 |
| No. | Result | Record | Opponent | Type | Round, time | Date | Location | Notes |
| 22 | Win | 20–2 | Sandy Ryan | MD | 10 | Sep 27, 2024 | The Theater at Madison Square Garden, New York City, New York, U.S. | Won WBO female welterweight title |
| 21 | Loss | 19–2 | Natasha Jonas | SD | 10 | Jan 20, 2024 | Liverpool Arena, Liverpool, England | For IBF female welterweight title |
| 20 | Win | 19–1 | Silvia Bortot | UD | 10 | Sep 2, 2023 | Manchester Arena, Manchester, England | |
| 19 | Win | 18–1 | Lucy Wildheart | UD | 10 | Apr 15, 2023 | Copper Box Arena, London, England | Won vacant WBC interim lightweight title |
| 18 | Loss | 17–1 | Alycia Baumgardner | SD | 10 | Oct 15, 2022 | The O2 Arena, London, England | Lost WBO, IBF, and The Ring female super featherweight titles; For WBC female super featherweight title |
| 17 | Win | 17–0 | Jennifer Han | UD | 10 | Apr 9, 2022 | OC Fair & Event Center, Costa Mesa, California, U.S. | Retained WBO, IBF, The Ring female super featherweight titles |
| 16 | Win | 16–0 | Maïva Hamadouche | UD | 10 | Nov 5, 2021 | Virgin Hotels Las Vegas, Paradise, Nevada, U.S. | Retained WBO female super featherweight title; Won IBF and inaugural The Ring super featherweight titles |
| 15 | Win | 15–0 | Érica Farías | UD | 10 | Jun 19, 2021 | Virgin Hotels Las Vegas, Paradise, Nevada, U.S. | Retained WBO female super featherweight title |
| 14 | Win | 14–0 | Ewa Brodnicka | UD | 10 | Oct 31, 2020 | MGM Grand Conference Center, Paradise, Nevada, U.S. | Won vacant WBO female super featherweight title |
| 13 | Win | 13–0 | Helen Joseph | UD | 10 | Jul 14, 2020 | MGM Grand Conference Center, Paradise, Nevada, U.S. | |
| 12 | Win | 12–0 | Alejandra Soledad Zamora | RTD | 6 (10), 2:00 | Oct 26, 2019 | Reno-Sparks Convention Center, Reno, Nevada, U.S. | Retained WBC-NABF female super featherweight title |
| 11 | Win | 11–0 | Lizbeth Crespo | UD | 10 | Jun 15, 2019 | MGM Grand Garden Arena, Paradise, Nevada, U.S. | |
| 10 | Win | 10–0 | Yareli Larios | UD | 8 | Feb 15, 2019 | Grand Casino, Hinckley, Minnesota, U.S. | Retained WBC-NABF female super featherweight title |
| 9 | Win | 9–0 | Calista Silgado | UD | 8 | Dec 14, 2018 | American Bank Center, Corpus Christi, Texas, U.S. | Retained WBC-NABF female super featherweight title |
| 8 | Win | 8–0 | Vanessa Bradford | UD | 8 | Oct 13, 2018 | CHI Health Center, Omaha, Nebraska, U.S. | Won vacant WBC-NABF female super featherweight title |
| 7 | Win | 7–0 | Edina Kiss | TKO | 3 (6), 2:00 | Aug 25, 2018 | Gila River Arena, Glendale, Arizona, U.S. | |
| 6 | Win | 6–0 | Sheena Flamand | UD | 6 | Jun 30, 2018 | Chesapeake Energy Arena, Oklahoma City, Oklahoma, U.S. | |
| 5 | Win | 5–0 | Baby Nansen | UD | 6 | May 12, 2018 | Madison Square Garden, New York City, New York, U.S. | |
| 4 | Win | 4–0 | Maria Semertzoglou | KO | 1 (4), 0:35 | Mar 10, 2018 | StubHub Center, Carson, California, U.S. | |
| 3 | Win | 3–0 | Nydia Feliciano | MD | 4 | Dec 9, 2017 | The Theater at Madison Square Garden, New York City, New York, U.S. | |
| 2 | Win | 2–0 | Allison Martinez | TKO | 3 (4), 0:39 | Sep 22, 2017 | Convention Center, Tucson, Arizona, U.S. | |
| 1 | Win | 1–0 | Widnelly Figueroa | KO | 1 (4), 1:15 | Aug 5, 2017 | Microsoft Theater, Los Angeles, California, U.S. | |

## Personal life

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