Mikaela Mayer

Mikaela Joslin Mayer (born July 4, 1990) is an American professional boxer who has held world championships in three weight classes. She has held the WBO female welterweight title since September 2024 and was previously unified female super-welterweight and super-featherweight champion. As an amateur, she won a bronze medal at the 2012 World Championships and competed for the U.S. at the 2016 Olympics.

In 2025, Mayer was named Sports Illustrated's Female Fighter of the Year.

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 made the first defense of her WBO welterweight title in a rematch against Sandy Ryan at Fontainebleau in Las Vegas on 29 March 2025. She won by unanimous decision.

Unified Super-welterweight Championship Mayer vs. Spencer Mayer challenged WBA female super-welterweight champion Mary Spencer on October 30, 2025, at Casino de Montreal in Montreal, Canada. The vacant WBC and WBO female super-welterweight titles were also on the line. Mayer won by unanimous decision.

In March 2026, it was announced that Mayer signed with Most Valuable Promotions.

Mayer vs. Cameron Holding the unified WBA and WBC female super-welterweight titles, Mayer faced WBO female super-welterweight champion Chantelle Cameron in a championship unification bout at bp pulse LIVE in Birmingham, England, on August 29, 2026. She lost by unanimous decision.

Professional boxing record

ResultRecordOpponentTypeRound, timeDateLocationNotes25Loss22–3Chantelle CameronUD10Aug 29, 202624Win22–2Mary SpencerUD10Oct 30, 202523Win21–2Sandy RyanUD10Mar 29, 202522Win20–2Sandy RyanMD10Sep 27, 202421Loss19–2Natasha JonasSD10Jan 20, 202420Win19–1Silvia BortotUD10Sep 2, 202319Win18–1Lucy WildheartUD10Apr 15, 202318Loss17–1Alycia BaumgardnerSD10Oct 15, 202217Win17–0Jennifer HanUD10Apr 9, 202216Win16–0Maïva HamadoucheUD10Nov 5, 202115Win15–0Érica FaríasUD10Jun 19, 202114Win14–0Ewa BrodnickaUD10Oct 31, 202013Win13–0Helen JosephUD10Jul 14, 202012Win12–0Alejandra Soledad ZamoraRTD6 (10), Oct 26, 201911Win11–0Lizbeth CrespoUD10Jun 15, 201910Win10–0Yareli Larios UD8Feb 15, 2019 9Win9–0Calista Silgado UD8Dec 14, 20188Win8–0Vanessa BradfordUD8Oct 13, 20187Win7–0Edina KissTKO3 (6), Aug 25, 20186Win6–0Sheena Flamand UD6Jun 30, 2018 5Win5–0Baby NansenUD6May 12, 20184Win4–0Maria SemertzoglouKO1 (4), Mar 10, 20183Win3–0Nydia Feliciano MD4Dec 9, 20172Win2–0Allison MartinezTKO3 (4), Sep 22, 20171Win1–0Widnelly FigueroaKO1 (4), Aug 5, 2017

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

Mikaela Mayer

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