Kosei Tanaka: Japan’s Fastest Four-Weight World Champion

Kosei Tanaka, a Japanese professional boxer, has etched his name in the annals of boxing history by becoming the fastest four-weight world champion. Born on June 15, 1995, in Tajimi, Japan, Tanaka’s meteoric rise to the top has been nothing short of remarkable.

Despite suffering from Legg–Calvé–Perthes disease as a child, Tanaka’s determination and passion for boxing were unwavering. He honed his skills as an amateur, winning four national high school tournaments in the junior-flyweight division. His impressive amateur record of 46-5 (13 KOs) paved the way for his professional debut in 2013 at the age of 18.

Tanaka’s ascent to greatness was swift and relentless. In just his fifth professional bout, he captured the WBO mini-flyweight title, becoming the fastest Japanese fighter ever to become a world champion. Not content with this achievement, Tanaka continued to blaze a trail, winning the WBO junior-flyweight title in 2016 and the WBO flyweight title in 2018.

His crowning glory came in February 2024 when he secured the WBO junior-bantamweight title, cementing his status as a four-weight world champion in an astonishing 21 fights. This feat surpassed the record previously held by Oscar De La Hoya, making Tanaka the fastest four-division champion in boxing history.

Tanaka’s journey has been marked by impressive victories and brutal knockouts. His fight against Jonathan González in August 2019 saw him deliver a devastating knockout in the seventh round after trailing on all three judges’ scorecards. Similarly, his New Year’s Eve bout in 2019 against Wulan Tuolehazi ended with a third-round knockout, showcasing Tanaka’s relentless pursuit of excellence.

Despite his remarkable achievements, Tanaka remains humble and focused on his craft. His dedication to the sport and his unwavering determination have earned him a cult following among boxing enthusiasts worldwide.

As Tanaka continues to make his mark in the boxing world, his journey serves as an inspiration to aspiring athletes everywhere. His story is a testament to the power of perseverance, hard work, and an unwavering pursuit of greatness.


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