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Kosuke Hayashi started his career aged 38 on February 2005. After 15 fights, Hayashi remains unbeaten with no sign of being beaten after building up his record of 15 wins and a career lasting 8 years so far. Hayashi's longest KO streak is 3 fights long out of his 15 pro career fights.
Getting rid of his debut fight nerves early, Hayashi took on Naoyuki Imada in February 2005 and claimed a stoppage victory (round 3, TKO). Hayashi was the first person to have ever stopped Imada. Following his debut, Hayashi had an impressive start to his career as he went on to win his next 8 fights including 4 times in 2005 and 4 times in 2006 fighting the likes of as Takashi Yamaguchi, Kohei Kobayashi and Takuma Ito.
Yuki Sato was up next for Hayashi on September 18th, 2005. Hayashi continued with his winning streak by beating Sato. Hayashi's fight against Yuki Sato came in the 3rd round of a 4 round fight via TKO. Hayashi became the first person to stop Sato. Hayashi fought boxers including Yosuke Takeuchi and Kohei Kobayashi and he went on to win another 2 fights.
Hayashi then went on to fight and beat Takashi Yamaguchi on May 16th, 2006 maintaining his unbeaten record. Yamaguchi was a worthy challenger but Hayashi was too much and became the first person to stop Yamaguchi via TKO during round 4. 3 wins followed where Hayashi went on to be the 4th person to go the distance with Tomoaki Hashizume, 4th person to go the distance with Takuma Ito and 7th person to stop Anuparap Twingym (Round 2 KO).
Masato Okita was beaten next on December 17th, 2006 meaning Hayashi could maintain his unbeaten streak. Hayashi's fight against Masato Okita came in the 5th round of a 6 round fight via TKO. Hayashi became the first person to stop Okita. 3 wins followed for Hayashi including being the 2nd person to beat Yuki Kajiyama, 5th person to beat Hideki Imanishi and first boxer to go the distance with Narongnoi Patavikorngym.
Yusuke Morishima was beaten next on November 3rd, 2007 meaning Hayashi could maintain his unbeaten streak. Hayashi secured the win over Morishima after the final bell via UD, resulting in Hayashi being the 11th person to defeat Morishima.
Kosuke Hayashi retained his unbeaten record in his most recent fight by beating Daisuke Maruyama on March 9th, 2008, increasing his record to 15 wins. Hayashi's win against Maruyama was only the 2nd time Maruyama had been stopped. The fight finished in the 7th round of a 10 round fight via TKO.