is a

Japanese Japanese may refer to: * Something from or related to Japan, an island country in East Asia * Japanese language, spoken mainly in Japan * Japanese people, the ethnic group that identifies with Japan through ancestry or culture ** Japanese diaspor ...

Muay Thai Muay Thai or Muaythai (, , ), sometimes referred to as Thai boxing, the Art of Eight Limbs or the Science of Eight Limbs, is a Thai martial art and full-contact combat sport that uses stand-up striking, sweeps, and various clinch fighting, cl ...

kickboxer Kickboxing ( ) is a full-contact hybrid martial art and boxing type based on punching and kicking. Kickboxing originated in the 1950s to 1970s. The fight takes place in a boxing ring, normally with boxing gloves, mouth guards, shorts, and ...

, currently competing in the bantamweight division of

RISE Rise or RISE may refer to: Arts, entertainment, and media Fictional entities * '' Rise: The Vieneo Province'', an internet-based virtual world * Rise FM, a fictional radio station in the video game ''Grand Theft Auto 3'' * Rise Kujikawa, a vide ...

, where he is the incumbent RISE Bantamweight champion. As of March 2023, he is ranked as the fifth best super flyweight (-55 kg) kickboxer in the world by Beyond Kickboxing and sixth best flyweight (-56.7 kg) by Combat Press.

Martial arts career

Early career

Osaki made his professional debut at J-NETWORK J-KICK 2016～Honor the fighting spirits～2nd with a unanimous decision victory over Idomu Tateshima. He amassed a 10-2-1 record, before fighting Satoshi Katashima for the WMC Japan Super Flyweight title at Muay Lok 2018 Challenge. Osaki won the title with a fourth-round TKO. In his next fight, at J-KICK 2018～4th～, Osaki fought Masanori Matsuzaki for the J-NETWORK Super Flyweight title. He won the fight by unanimous decision. On May 26, 2019, Osaki fought Koudai Hirayama for the HOOST CUP -53 kg title. Hirayama won the fight by an extra round majority decision.

RISE

Bantamweight

Osaki faced

Jin Mandokoro Jin Mandokoro (born 3 September 1998) is a Japanese kickboxer. Combat Press ranks him as the #4 strawweight in the world, as of August 2021. He was ranked in the flyweight top ten between September 2020, and July 2021. Kickboxing career DEEP K ...

in his

debut at RISE 135 on November 4, 2019. He lost the fight by unanimous decision. Osaki faced Kazuya Okuwaki, in his second RISE appearance, at RISE 142 on September 4, 2019. He won the fight by a first-round knockout, flooring Okuwai with a high kick. Osaki faced the third-ranked RISE bantamweight contender Kyosuke at RISE 145 on January 30, 2021. He won the fight by a second-round knockout. Osaki dropped his opponent with a low kick 30 seconds into the final round of the contest, which left his opponent unable to rise from the canvas. Osaki faced Kaito Fukuda for the BOM Bantamweight title at BOM WAVE 04 on April 11, 2021. He won the fight by unanimous decision, with two scorecards of 49–48 and one scorecard of 49–47. After capturing his third professional championship, Osaki was booked to face Azusa Kaneko in a reserve fight of the 2021 RISE Dead or Alive Tournament, which took place on July 18, 2021. He won the fight by unanimous decision, with scores of 30–29, 30–29 and 30–28. Osaki was scheduled to face Koudai Hirayama in a tournament reserve match at RISE WORLD SERIES 2021 Yokohama on September 23, 2021. The two fought previously on May 26, 2019, with Hirayama winning by an extra round majority decision. Osaki was later rescheduled to face Shiro in the tournament semifinals, as a short notice replacement for his brother Kazuki Osaki. He was later removed from the tournament, as he had missed weight by 3.2 kg.

Catchweight bouts

Osaki was booked to face Tatsuto Ito at 57.5 kg for RISE 156 on March 27, 2022. He won the fight by unanimous decision, with all three judges scoring the bout 30–28 in his favor. Osaki faced Yugo Kato in a 55.5 kilogram bout at the May 28, 2022, NO KICK NO LIFE event. He won the fight by a fourth-round technical knockout. Osaki faced Jyosei at RISE 160 on July 29, 2022, in a 56 kg catchweight bout. He won the fight by a first-round technical knockout, after knocking Jyosei down three times by the midway point of the opening round.

Return to bantamweight

Osaki faced Shiro at RISE World Series 2022 on October 15, 2022. They were initially expected to face each other in the semifinals of the 2021 RISE "Dead or Alive" bantamweight tournament, before the fight was cancelled due to Osaki missing weight. He lost the fight by unanimous decision, after an extra fourth round was fought. Osaki faced Seiki Ueyama at RISE World Series / SHOOTBOXING-Kings 2022 on December 25, 2022. At the official weigh-ins, Ueyama missed weight by 1.5 kg, which resulted in him being deducted two points before the start of the fight and having to fight in bigger gloves. Osaki won the fight by unanimous decision, with one scorecard of 29–28 and two scorecards of 29–27. Osaki faced Ryoga Terayama in the main event of RISE 165: RISE 20th Memorial event on February 23, 2023. The fight ended in a majority decision draw. Osaki landed an accidental low blow midway through the final round, which rendered his opponent unable to continue fighting and prompted the referee to call for a technical decision. The pair was booked to fight in an immediate rematch at RISE 168 on May 28, 2023. He won the fight by a second-round technical knockout. Osaki faced Yugo Kato in a RISE Bantamweight title eliminator at RISE World Series 2023 - 2nd Round on August 26, 2023. He won the fight by unanimous decision, with scores of 30–29, 29–28 and 29–28.

RISE Bantamweight champion

Osaki challenged

Masahiko Suzuki is a Japanese kickboxer, currently competing in the bantamweight division of RISE. He is the former RISE Bantamweight Champion, having held the title between 2018 and 2023. As of August 2023, he is ranked as the third best flyweight (-56.7kg ...

for the RISE Bantamweight (-55kg) title at RISE 174 on December 10, 2023. He won the fight by unanimous decision, with scores of 50–47, 50–47 and 50–48. Osaki was expected Aiman Lahmar at RISE 178 on May 19, 2024. Lahmar withdrew from the fight on May 7, due to knee and hip injuries, and was replaced by Samvel Babayan. Babayan was himself forced to withdraw with visa issues and was replaced by Yodbuadang 3rdplacegym. Osaki made his first RISE Bantamweight (-55kg) title defense against Ryunosuke Omori at RISE 181 on August 31, 2024. He retained the title by way of unanimous decision, with scores of 49–47, 50–47 and 50–46. Osaki was able to knock his opponent down once, with a right straight in the opening round. Osaki made his

ONE Championship ONE Championship, formerly ONE Fighting Championship (ONE FC) until January 2015, is a Multinational corporation, multinational combat sports Promoter (entertainment), promotion founded on 14 July 2011 by Chatri Sityodtong and Victor Cui. Origi ...

debut against Huo Xiaolong at ONE Friday Fights 86 on November 8, 2024. He won the fight by unanimous decision. Osaki faced the former RISE featherweight champion Keisuke Monguchi in a bantamweight non-title bout at RISE Fire Ball on May 11, 2025. He won the fight by second-round technical knockout.

Championships and accomplishments

Professional

*J-NETWORK ** 2018 J-NETWORK Super Flyweight Champion * World Muay Thai Council ** 2018 WMC Japan Super Flyweight Champion *Battle of Muay Thai ** 2021 BOM Bantamweight Champion *

** 2023 RISE Bantamweight (-55kg) Champion *** One successful title defense

Amateur

* 2013 Muay Thai Windy Super Fight -40 kg Champion * 2014 All Japan Jr. Kick -45 kg Champion * 2015 J-NETWORK All Japan A-league -53 kg Winner & Spirit Award

Fight record

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Nagoya is the largest city in the Chūbu region of Japan. It is the list of cities in Japan, fourth-most populous city in Japan, with a population of 2.3million in 2020, and the principal city of the Chūkyō metropolitan area, which is the List of ...

Japan Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...

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Lumpinee Stadium Lumpinee Boxing Stadium () is a sporting arena in Bangkok, Thailand. Opened more than a decade later than Rajadamnern Stadium, Lumpinee is run by the Royal Thai Army. It has become the symbol of modern Muay Thai. Only Rajadamnern Stadium riv ...

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Bangkok, Thailand Bangkok, officially known in Thai language, Thai as Krung Thep Maha Nakhon and colloquially as Krung Thep, is the capital and most populous city of Thailand. The city occupies in the Chao Phraya River delta in central Thailand and has an estim ...

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Tokyo Tokyo, officially the Tokyo Metropolis, is the capital of Japan, capital and List of cities in Japan, most populous city in Japan. With a population of over 14 million in the city proper in 2023, it is List of largest cities, one of the most ...

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Tokyo, Japan Tokyo, officially the Tokyo Metropolis, is the capital of Japan, capital and List of cities in Japan, most populous city in Japan. With a population of over 14 million in the city proper in 2023, it is List of largest cities, one of the most ...

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, , Decision (Unanimous) , , 3 , , 3:00 , - style="background:#cfc;" , 2023-05-28 , , Win, , align=left, Ryoga Terayama , , RISE 168 , ,

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, , Tech. Decision (Majority) , , 3 , , 1:54 , - , - style="background:#cfc;" , 2022-12-25, , Win , , align=left, Seiki Ueyama , , RISE WORLD SERIES / SHOOTBOXING-KINGS 2022, ,

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, , Ext.R Decision (Unanimous) , , 4, , 3:00 , - , - style="text-align:center; background:#cfc" , 2022-07-29, , Win , , align=left, Jyosei , , RISE 160 , ,

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, , Decision (Unanimous) , , 3, , 3:00 , - style="text-align:center; background:#cfc;" , 2021-07-18, , Win, , align=left, Azusa Kaneko , , RISE WORLD SERIES 2021 - Dead or Alive Tournament, Reserve Fight , ,

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Yokohama, Japan is the second-largest city in Japan by population as well as by area, and the country's most populous municipality. It is the capital and most populous city in Kanagawa Prefecture, with a population of 3.7 million in 2023. It lies on Tokyo B ...

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, , KO (Low Kick), , 2 , , , - style="text-align:center; background:#cfc;" , 2020-12-06 , , Win , , align=left, Sanchai TeppenGym, , BOM WAVE 03 ~ Get Over The COVID-19 , ,

Yokohama is the List of cities in Japan, second-largest city in Japan by population as well as by area, and the country's most populous Municipalities of Japan, municipality. It is the capital and most populous city in Kanagawa Prefecture, with a popu ...

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, , Decision (Unanimous) , , 3 , , 3:00 , - style="text-align:center; background:#CCFFCC;" , 2019-10-04 , , Win , , align=left, Takumi Hamada , , KNOCK OUT X REBELS, ,

, , Decision (Unanimous) , , 3 , , 3:00 , - style="text-align:center; background:#CCFFCC;" , 2019-09-10 , , Win , , align=left, Kotchasarn Sor Jor Toipaedriew , ,

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Nagoya, Japan is the largest city in the Chūbu region of Japan. It is the list of cities in Japan, fourth-most populous city in Japan, with a population of 2.3million in 2020, and the principal city of the Chūkyō metropolitan area, which is the List of ...

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, , KO (Right Cross) , , 2 , , 1:12 , - style="text-align:center; background:#FFBBBB;" , 2019-02-11 , , Loss , , align=left, Yoshiho Tane , , KNOCK OUT 2019 WINTER , ,

, , TKO (Punches), , 5 , , 0:51 , - style="text-align:center; background:#CCFFCC;" , 2019-01-16 , , Win , , align=left, Yoshiki Tane , , ROAD TO KNOCK OUT Vol. 3, ,

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, , Decision (Unanimous), , 5 , , 3:00 , - ! style=background:white colspan=9 , , - style="text-align:center; background:#CCFFCC;" , 2018-09-23 , , Win , , align=left, Satoshi Katashima , , Muay Lok 2018 Challenge , ,

, , TKO (Left Elbow), , 4 , , 2:39 , - ! style=background:white colspan=9 , , - style="text-align:center; background:#CCFFCC;" , 2018-08-19 , , Win , , align=left, Tatsuya Hibata , , J-NETWORK J-KICK 3rd , ,

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Saraburi Saraburi City ('' thesaban mueang'') is the provincial capital of Saraburi Province in central Thailand. In 2020, it had a population of 60,809 people, and covers the complete ''tambon'' Pak Phriao of the Mueang Saraburi district. Location ...

Thailand Thailand, officially the Kingdom of Thailand and historically known as Siam (the official name until 1939), is a country in Southeast Asia on the Mainland Southeast Asia, Indochinese Peninsula. With a population of almost 66 million, it spa ...

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, , KO (Left Middle Kick) , , 1 , , 1:29 , - style="text-align:center; background:#CCFFCC;" , 2017-05-28 , , Win , , align=left, Masayoshi Kunimoto , , HOOST CUP STAND FIGHTING NETWORK KING, ,

, , Decision (Unanimous), , 3 , , 3:00 , - style="text-align:center; background:#c5d2ea;" , 2017-03-05 , , NC, , align=left, Atsumu , , Muay Lok 2017 1st, ,

, , Doctor Stop (Head clash), , 1 , , , - style="text-align:center; background:#CCFFCC;" , 2016-11-20 , , Win , , align=left, Takenari Izumi , , HOOST CUP STAND FIGHTING NETWORK KING, ,

, , TKO (Left Knee) , , 1 , , 2:15 , - style="text-align:center; background:#FFBBBB;" , 2016-06-26 , , Loss , , align=left, Yuki Kojima , , J-NETWORK J-FIGHT & J-GIRLS 2016 3rd, ,

, , Decision (Majority) , , 3 , , 3:00 , - style="text-align:center; background:#CCFFCC;" , 2016-05-05 , , Win , , align=left, Idomu Tateshima , , J-NETWORK J-KICK 2016～Honor the fighting spirits～2nd, ,

, , Decision (Unanimous) , , 3 , , 3:00 , - , colspan=9 , ''Legend'':

Amateur record

References

{{DEFAULTSORT:Osaki, Koki 1999 births Living people Japanese male kickboxers Flyweight kickboxers Kickboxing champions Japanese male Muay Thai practitioners Martial artists from Nagoya Martial artists from Aichi Prefecture 21st-century Japanese sportsmen