Kosei Tanaka
Kosei Tanaka held 4 world titles across 4 weight classes, from minimumweight to super flyweight, between 2015 and 2024. Tanaka first became a world champion aged 19 after winning the WBO minimumweight world title by beating Julian Yedras.
- World title bouts
- 12
- Record in world title bouts (won–lost)
- 10–2
- World titles held
- 4
- Longest world title reign (WBO flyweight, 2018–2020)
- 1 year, 4 months
Timeline of world title events
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2024
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The Ring magazine rates Kosei Tanaka No. 5 at super flyweight in its annual ratings
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Phumelele Cafu beats Kosei Tanaka via split decision 12/12
Super Flyweight · WBO
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Kosei Tanaka beats Christian Bacasegua Rangel via unanimous decision 12/12
Super Flyweight · WBO
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2023
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The Ring magazine rates Kosei Tanaka No. 5 at super flyweight in its annual ratings
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2022
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The Ring magazine rates Kosei Tanaka No. 8 at super flyweight in its annual ratings
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2020
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Kazuto Ioka beats Kosei Tanaka via knockout 8/12
Super Flyweight · WBO
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Kosei Tanaka’s reign as the WBO flyweight world champion ends
Flyweight · WBO
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2019
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Kosei Tanaka beats Wulan Tuolehazi via knockout 3/12
Flyweight · WBO
The Ring magazine rates Kosei Tanaka No. 1 at flyweight in its annual ratings
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Kosei Tanaka beats Jonathan Gonzalez via knockout 7/12
Flyweight · WBO
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Kosei Tanaka beats Ryoichi Taguchi via unanimous decision 12/12
Flyweight · WBO
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2018
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The Ring magazine rates Kosei Tanaka No. 2 at flyweight in its annual ratings
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Kosei Tanaka beats Sho Kimura via majority decision 12/12
Flyweight · WBO
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2017
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Kosei Tanaka’s reign as the WBO light flyweight world champion ends
Light Flyweight · WBO
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Kosei Tanaka beats Rangsan Chayanram via knockout 9/12
Light Flyweight · WBO
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Kosei Tanaka beats Angel Acosta via unanimous decision 12/12
Light Flyweight · WBO
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2016
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Kosei Tanaka beats Moises Fuentes via knockout 5/12
Light Flyweight · WBO
The Ring magazine rates Kosei Tanaka No. 4 at light flyweight in its annual ratings
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Kosei Tanaka’s reign as the WBO minimumweight world champion ends
Minimumweight · WBO
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2015
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Kosei Tanaka beats Victorio Saludar via knockout 6/12
Minimumweight · WBO
The Ring magazine rates Kosei Tanaka No. 3 at minimumweight in its annual ratings
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Kosei Tanaka beats Julian Yedras via unanimous decision 12/12
Minimumweight · WBO
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2014
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The Ring magazine rates Kosei Tanaka No. 3 at minimumweight in its annual ratings