Momo Koseki
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| Personal information | |
|---|---|
| Nationality | Japanese |
| Born | 31 July 1982 Tokyo, Japan |
| Height | 5 ft 4 in (163 cm) |
| Weight | |
| Boxing career | |
| Reach | 64 in (163 cm) |
| Stance | Southpaw |
| Boxing record | |
| Total fights | 27 |
| Wins | 24 |
| Win by KO | 9 |
| Losses | 2 |
| Draws | 1 |
Momo Koseki (小関桃, Koseki Momo; born 31 July 1982) is a Japanese former professional boxer. She is a two-weight world champion, having held the WBC female atomweight title from 2008 to 2015; the WBA female atomweight title in 2015; and the WBC female strawweight title in 2017. Koseki made a record-breaking seventeen consecutive title defenses of her WBC atomweight title. Koseki is a member of the International Women's Boxing Hall of Fame.
Koseki was inspired to take up boxing after watching Hiroshi Kawashima on TV. Koseki won the inaugural All-Japan women's amateur championships in 2003, as well as the second edition in 2004. After winning a third national amateur title in 2007, she decided to turn pro as women's boxing was not yet accepted as an Olympic sport.[1]
Koseki won her first three bouts. She went on to challenge Winyu Paradorngym for the inaugural WBC atomweight world title. Winyu won the fight by unanimous decision.[2] In her next fight, Koseki moved up two weight classes to challenge for the WBC light flyweight title, but lost again by unanimous decision.[3] In August 2008, Koseki rematched Paradorngym, and won the title with a round 2 knockout at Korakuen Hall. In August 2014, Koseki made her fourteenth consecutive defense, beating Denise Castle with a round 8 technical knockout. With the win, Koseki broke Yoko Gushiken's Japanese national record of 13 consecutive successful world title defenses.[4] In October 2015, Koseki beat WBA champion Ayaka Miyao by unanimous decision to make her sixteenth defense and unify titles.[5]
Koseki won the WBC minimumweight title on 17 December 2017, defeating reigning champion Yuko Kuroki by decision.[6]
She retired on 29 January 2018, at the age of 34.[7][8]
In October 2025, Koseki was named among the inductees for the 2026 International Women's Boxing Hall of Fame class.[9]