Kosei Tanaka (Japanese: 田中 恒成; born June 15, 1995) is a retired Japanese professional boxer widely regarded as one of the fastest-rising champions in boxing history. Known for his exceptional speed, technique, and resilience, Tanaka became a four-weight world champion, achieving the feat in record time. His career spanned from 2013 to 2025, during which he won titles in the WBO mini-flyweight, junior-flyweight, flyweight, and junior-bantamweight divisions.
Tanaka’s ability to conquer multiple weight classes in such a short period made him one of Japan’s most celebrated boxing figures. Despite a promising career, he retired in 2025 at the age of 29 due to repeated eye injuries that affected his vision.
His Salary and Net Worth
Kosei Tanaka Salary
Throughout his boxing career, Kosei Tanaka earned respectable purses from his world title bouts and sponsorship deals. During his peak years between 2018 and 2024, he was among Japan’s highest-earning lightweight fighters. Reports suggest that Tanaka’s fight purses ranged from $75,000 to $200,000 USD for major world title fights. In addition to his fight earnings, he benefited from endorsements, Japanese broadcasting deals, and event promotions.
Kosei Tanaka Net Worth
While exact financial details are private, Kosei Tanaka’s estimated net worth is between $500,000 and $1 million USD as of 2025. This figure takes into account his championship earnings, sponsorships, and appearance fees. Although not as high as global boxing superstars, his financial success within the lighter divisions reflects his consistent performance and popularity in Japan’s boxing scene.
Kosei Tanaka Age and Height
Kosei Tanaka was born on June 15, 1995, in Tajimi, Gifu, Japan. As of 2025, he is 30 years old. Despite his young age, he accomplished what most boxers strive for over decades—becoming a four-division world champion.
Height and Reach
Tanaka stands 5 feet 4½ inches (164 cm) tall with a reach of approximately 64½ inches (164 cm). His compact build and exceptional hand speed allowed him to dominate faster and lighter opponents across several divisions.
Kosei Tanaka’s Wife or Girlfriend
Kosei Tanaka has remained very private about his personal life. As of 2025, there is no publicly confirmed information about a wife or girlfriend. The boxer has kept his focus primarily on his career and family rather than public relationships. While some Japanese athletes frequently appear in media interviews discussing their personal lives, Tanaka has chosen to stay out of the spotlight in this regard.
His boxing career, net worth, age, height, salary, family, and biography
| Category | Details |
|---|---|
| Full Name | Kosei Tanaka (田中恒成) |
| Nickname | “The Amazing Boy” |
| Age | 30 years old (as of 2025) |
| Date of Birth | June 15, 1995 |
| Birth Place | Tajimi, Gifu, Japan |
| Nationality | Japanese |
| Height | 5 ft 4 in (163 cm) |
| Weight | Competes in Super Flyweight (formerly Minimumweight, Light Flyweight, Flyweight) |
| Reach | 64 in (163 cm) |
| Stance | Orthodox |
| College / Education | Chukyo High School, Nagoya |
| Turned Professional | 2013 |
| Professional Debut | November 10, 2013 vs Oscar Raknafa |
| Total Fights | 21 |
| Wins | 20 |
| Wins by KO | 11 |
| Losses | 1 (to Kazuto Ioka in 2020) |
| Draws | 0 |
| Current Status (2025) | Active professional boxer |
| Titles Held | Former WBO Minimumweight, WBO Light Flyweight, and WBO Flyweight World Champion |
| Highest Ranking | Top 3 Super Flyweight (The Ring & BoxRec, 2025) |
| Promoter | Tanaka Boxing Gym |
| Trainer | Kiyoshi Hatanaka |
| Father’s Name | Hitoshi Tanaka |
| Mother’s Name | Not publicly disclosed |
| Wife | Married (spouse’s name not publicly disclosed) |
| Children | 1 (private life kept discreet) |
| Religion | Not publicly stated (likely non-religious / Shinto background) |
| Residence | Nagoya, Aichi, Japan |
| @kosei.tanaka.official | |
| Boxing Style | Fast, technical, with explosive combinations and body shots |
| Famous Rival | Kazuto Ioka |
| Notable Victories | Moises Fuentes, Vic Saludar, Sho Kimura, Angel Acosta |
| Wiki Page | Kosei Tanaka (Wikipedia, Japanese and English editions) |
| Net Worth (Approx.) | $2 million (estimated 2025) |
| Languages | Japanese, limited English |
| Hobbies | Training, watching baseball, and traveling |
| Achievements | Became a three-division world champion in just 12 fights — one of the fastest in history |
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His Latest Career News
Retirement in 2025
In June 2025, Kosei Tanaka officially announced his retirement from professional boxing, citing recurring eye injuries. After undergoing several surgeries, he revealed that his right eye had “severely distorted vision,” making it impossible for him to continue fighting safely.
His retirement marked the end of an extraordinary career that began when he turned professional at the age of 18.
Final Fight in 2024
Tanaka’s last professional bout took place on October 14, 2024, at Ariake Arena in Tokyo. He defended his WBO super-flyweight title against South African boxer Phumelele Cafu but lost the fight by split decision.
Before this, a scheduled defense against Jonathan Rodriguez was cancelled after his opponent failed to make weight.
Legacy and Impact
Even after retirement, Kosei Tanaka remains a highly respected figure in Japanese boxing. His determination, discipline, and record-breaking rise through the ranks have inspired a new generation of young athletes.
There is speculation that he may transition into coaching or commentary, though no official announcement has been made.
His Achievements
Kosei Tanaka’s achievements stand among the most impressive in modern boxing history:
Four-Division World Champion (WBO titles in mini-flyweight, junior-flyweight, flyweight, and junior-bantamweight).
Fastest Japanese fighter to win a world title – achieved in only five professional fights.
Fastest boxer in history to win titles in three weight classes, tying with Vasyl Lomachenko at 12 fights.
Fastest four-division champion in world boxing history – reached the milestone in just 21 fights, surpassing Oscar De La Hoya’s record.
Professional Record: 22 fights – 20 wins (11 by KO), 2 losses.
Amateur Record: 46 wins and 5 losses, never stopped in his amateur career.
Despite suffering from Legg–Calvé–Perthes disease as a child, Tanaka overcame adversity to become one of the most technically gifted and mentally strong boxers Japan has ever produced.
Frequently Asked Questions (FAQs)
What is Kosei Tanaka’s age?
Kosei Tanaka is 30 years old, born on June 15, 1995, in Gifu, Japan.
How tall is Kosei Tanaka?
He stands 5 feet 4½ inches (164 cm) tall with a 64½-inch reach.
What is Kosei Tanaka’s net worth in 2025?
His estimated net worth is between $500,000 and $1 million USD, based on fight purses, sponsorships, and endorsements.
Why did Kosei Tanaka retire?
He retired in June 2025 due to serious and recurring eye injuries that affected his vision, making it unsafe to continue boxing.
How many world titles did Kosei Tanaka win?
Tanaka won four world titles across four different weight divisions, making him one of the few fighters in history to achieve this feat.
Is Kosei Tanaka married?
As of now, Kosei Tanaka is not publicly known to be married or dating anyone.
What is Kosei Tanaka’s boxing record?
He retired with an impressive record of 22 fights, 20 wins (11 by KO), and 2 losses.
Conclusion
Kosei Tanaka’s boxing career is a remarkable story of determination, talent, and record-breaking success. Rising from humble beginnings and overcoming childhood illness, he became a four-division world champion faster than anyone before him.
His lightning-fast hands, technical brilliance, and resilience made him a fan favorite and a national hero in Japan.
Although injuries ended his career early, his name remains etched in boxing history. Kosei Tanaka is celebrated not only for his achievements inside the ring but also for his discipline, humility, and sportsmanship — qualities that continue to inspire young boxers worldwide.
