Who has Mikaela Mayer lost to? A look at the American boxer's defeats and achievements

American boxing sensation Mikaela Mayer is set to face Sandy Ryan in the WBO welterweight title fight rematch at The Theater inside FountainBleu Las Vegas.

Mayer, the reigning WBO female welterweight champion and a former unified women's super featherweight champion, has enjoyed a successful career both as an amateur and professional boxer. She represented Team USA at the 2016 Rio Olympics and has held titles with the WBO and IBF.

However, Mayer has also faced her fair share of setbacks during her career. Let's take a look at her notable defeats and major achievements:

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A look at Mikaela Mayer's defeats and achievements

Mikaela Mayer's professional boxing journey began in 2017, and she quickly established herself as a rising star. She has won world titles in the super-featherweight and lightweight divisions, defeating top-ranked opponents like Ewa Brodnicka, Maïva Hamadouche, and Lucy Wildheart.

However, Mayer has also faced setbacks in her career. One of her most notable losses came against Alycia Baumgardner in October 2022. There, she lost a close split decision for the WBC and IBO female super-featherweight world titles.

Mayer also suffered a split decision loss to Natasha Jonas in January 2024, in a bid for the IBF female world welterweight title.

Despite these defeats, Mayer has continued to prove herself as a top-level boxer. Her impressive amateur career, which included a bronze medal at the 2012 AIBA Women's World Boxing Championships, has laid a strong foundation for her professional success. She has also represented the United States at the Olympic Games and won numerous amateur titles.

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Mikaela Mayer vs. Sandy Ryan 2 fight date, start time, full card

The boxing rematch between Mikaela Mayer and Sandy Ryan is set to take place on Saturday, March 29. The card will start at 8 pm ET / 5 pm PT / 12:00 am GMT, while the main event ringwalks are expected to take place (approximately) at 11:00 pm ET / 8:00 pm PT / 3:00 am GMT.

While Mayer vs. Ryan 2 will headline the event, the WBO welterweight title fight between Brian Norman Jr. and Derrick Cuevas will be the co-main event. The card will feature several other exciting matchups.

Check out the full fight card below:

Main event: Women's welterweight - Mikaela Mayer vs. Sandy Ryan (WBO female welterweight title fight)

Co-main event: Welterweight - Brian Norman Jr. vs. Derrick Cuevas (WBO welterweight title fight)

Featherweight - Bruce Carrington vs. Jose Enrique Vivas

Light welterweight - Emiliano Vargas vs. Giovannie Gonzales

Middleweight - Troy Isley vs. Etoundi William

Welterweight - Delante Johnson vs. Kendo Castaneda

Light welterweight - Dedrick Crocklem vs. Dionne Ruvalcaba