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.

Mikaela Mayer
Born	Mikaela Joslin Mayer (1990-07-04) July 4, 1990 (age 35) Los Angeles, California, U.S.
Statistics
Weight(s)	Super featherweight Lightweight Welterweight
Height	5 ft 9 in (175 cm)
Reach	66+1⁄2 in (169 cm)
Stance	Orthodox
Boxing record
Total fights	23
Wins	21
Wins by KO	5
Losses	2
Medal record Women's Amateur boxing Representing  United States World Championships 2012 Qinhuangdao Light welterweight

Amateur career

Mayer competed internationally as part of Team USA in the women's 60 kg category at the 2016 Rio Summer Olympics.^[1][2] She defeated Jennifer Chieng in the Round of 16 before being eliminated in the quarterfinal by Russian Anastasia Belyakova, who took a majority decision.^[3]

Amateur accolades

• 2016 AIBA Americas Qualifier: Gold Medalist, Lightweight 60 kg (132 lb)^[4]
• 2016 Olympic Trials Champion^[4]
• 2015 USA Boxing National Champion 60 kg (132 lb)^[4]
• 2014 USA Boxing National Champion 60 kg (132 lb)^[4]
• 2012 AIBA Women's World Boxing Championships: Bronze Medalist, Light welterweight 64 kg (141 lb)^[4]
• 2012 AMBC Continental Championships: Gold Medalist 64 kg (141 lb)^[4]
• 2012 USA Boxing National Champion 64 kg (141 lb)^[4]
• 2012 U.S. Olympic Team Trials: Runner-Up 60 kg (132 lb)^[4]
• 2011 National Golden Gloves: Champion 60 kg (132 lb)^[4]

Professional career

After signing a promotional deal with Top Rank,^[5] Mayer made her professional debut on 5 August 2017, defeating Widnelly Figueroa by first-round knockout.^[6]

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.^[7]

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.^[8]

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.^[9]

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.^[10]

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.^[11][12][13]

WBO Welterweight Champion

Mayer vs. Ryan

Mayer was scheduled to challenge WBO welterweight champion Sandy Ryan in New York on September 27, 2024.^[14] She won the fight by majority decision.^[15] On the day of the fight, while leaving to the event, Ryan was hit by a tin of paint at her hotel.^[16] 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.^[17]

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.^[18][19][20]

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
23	Win	21-2	Sandy Ryan	UD	10	Mar 29, 2025	Fontainebleau, Las Vegas, Nevada, U.S.	Retained WBO female welterweight title
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.^[21][22]

See also

• List of female boxers