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

American boxing sensation Mikaela Mayer is set to headline against Sandy Ryan for the WBO welterweight title at The Theater at Madison Square Garden.

Mayer, 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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Ryan vs. Mayer fight date, start time, card revealed

The boxing match between Sandy Ryan and Mikaela Mayer is set to take place on Friday, Sept. 27. The main event ringwalks are scheduled for 11 p.m. ET / 4 a.m. UK, with the event beginning at 9 p.m. ET / 2 a.m. UK.

Apart from the main event, the undercard features several other exciting matchups, including Xander Zayas vs. Damian Sosa, Bruce Carrington vs. Sulaiman Segawa, and Elvis Rodriguez vs. Kendo Castaneda.

Take a look at the full fight card revealed so far below:

• Sandy Ryan vs. Mikaela Mayer; For Ryan's WBO women's welterweight title
• Xander Zayas vs. Damian Sosa; Light middleweight
• Bruce Carrington vs. Sulaiman Segawa; Featherweight
• Elvis Rodriguez vs. Kendo Castaneda; Super-lightweight
• Rohan Polanco vs. Marcelino Nicolas Lopez; Super-lightweight
• Vito Mielnicki Jr vs. Khalil El Harraz; Super-welterweight
• Delante Johnson vs. Yomar Alamo; Super-lightweight
• Floyd Diaz vs. Mario Hernandez; Bantamweight
• Ali Feliz vs. Orlando Rashad Coulter; Heavyweight