Shimon Yoshinari is a Japanese Muay Thai kickboxer. He currently competes in the Flyweight division of ONE Championship. As of September 22, 2026, Shimon is ranked #4 in the ONE Flyweight Muay Thai rankings. He is the reigning WBC Muaythai World Lightweight Champion.
Career Early career On December 6, 2020, Yoshinari faced Tenma at BOM WAVE 03 for the vacant WMC Japan Flyweight title. He won the fight by third-round knockout.
On November 7, 2021, Yoshinari faced Msayoshi Kunimoto at BOM WAVE 06 for the WMC Intercontinental Bantamweight title. He won the fight by unanimous decision.
On November 12, 2022, Yoshinari faced Takanobu Sano at BOM 37 as the semifinal of a Road to ONE Championship tournament. He won the fight by second-round knockout.
Yoshinari faced the then undefeated Ryu Hanaoka on February 24, 2021, at a NO KICK NO LIFE event. He won the fight by majority decision after five rounds.
On June 26, 2022, Yoshinari defeated Yuki Morioka by unanimous decision at Suk Wan Kingthong "to challenge" to capture the vacant WPMF International Super Bantamweight title.
Yoshinari defeated Ryota Mawatari by unanimous decision at BOM Road to ONE Japan as the final of the Road to ONE tournament. He earned a ONE Championship contract with that victory.
Rajadamnern World Series
On August 14, 2023, Yosinari faced Watcharapon Singhamawynn on the Muay Thai Pantamit promotion at the Thupatemi Stadium for the vacant Thailand Super-featherweight title. He won the fight by unanimous decision.
On December 23, 2023, Yoshinari rematched Watcharapon Singhamawynn on Rajadamnern World Series. He won the fight by unanimous decision.
On July 14, 2024, Yoshinari faced Wukong Sitjaroenwit at Rajadamnern World Series Japan. He won the fight by unanimous decision.
On September 23, 2024, Yoshinari faced Nongbew Jitmuangnon on the Muay Thai Pantamit promotion at the Thupatemi Stadium for the vacant Thailand Lightweight title. He won the fight by unanimous decision.
ONE Championship
Yoshinari made his ONE Championship debut on December 20, 2024, at ONE Friday Fights 92, against Rittidet Sor.Sommai. He won the fight by second-round technical knockout.
On March 23, 2025, Yoshinari faced Yodlekpet Or.Atchariya at ONE 172. He won the fight via unanimous decision.
On August 22, 2025, Yoshinari faced Pettonglor Sitluangpeenumfon at ONE Friday Fights 121. He won the fight by second-round technical knockout.
On October 5, 2025, Yoshinari faced Neungphusing Kor.Wuttichai for the vacant WBC Muay Thai World Lightweight title at BOM Ouroboros 2025. He won the fight by first-round knockout with a left hook.
On December 19, 2025, Yoshinari faced Dedduanglek Tded99 on ONE Friday Fights 137 at the Lumpinee Stadium. He won the fight by unanimous decision.
On April 29, 2026, Yoshinari faced Johan Ghazali at ONE Samurai 1. He won the fight by unanimous decision.
Yoshinari faced Suablack Tor.Pran49 at ONE Samurai 3. He won the fight by second-round knockout with a body punch.
Yoshinari was announced as one of the eight participants in the ONE Flyweight Muay Thai World Grand Prix. He was scheduled to face Ramadan Ondash on ONE The Inner Circle 38 for the quarterfinals of the Grand Prix.
Titles and accomplishments Professional World Muay Thai Council 2020 WMC Japan Flyweight Champion 2021 WMC Intercontinental Bantamweight Champion World Professional Muaythai Federation 2022 WPMF International Super Bantamweight Champion Professional Boxing Association of Thailand (PAT) 2023 Thailand Super-featherweight (130 lbs) Champion 2024 Thailand Lightweight (135 lbs) Champion World Boxing Council Muay Thai 2025 WBC Muay Thai World Lightweight (135 lbs) Champion
Amateur Suk Punpanmuang 25 kg Champion 2013 M-ONE WPMF 25 kg Champion 2014 M-ONE WPMF 30 kg Champion 2014 Battle of Muay Thai 30 kg Champion 2015 DBS -30 kg Champion 2015 Bigbang 31 kg Champion 2015 MA Kick Jr -32 kg Champion 2015 BOM Tournament 32.5 kg Champion 2015 SMASHERS 35 kg Champion 2016 WBC Muay Thai Jr League -31 kg Champion 2016 Suk Wan Kingthong 34 kg Champion 2016 Muay Thai Open 35 kg Champion 2016 Battle of Muay Thai -35 kg Champion 2017 WINDY Super Fight -38 kg Champion 2017 M-ONE WPMF -35 kg Champion 2017 Lumpinee Boxing Stadium of Japan -40 kg Champion 2017 M-ONE WPMF -40 kg Champion 2018 WINDY Super Fight -42 kg Champion 2018 M-ONE WPMF -40 kg Champion 2018 WMC Japan -40 kg Champion 2019 WPMF -50 kg Champion 2019 WMC Japan -50 kg Champion
Fight record
|- style="background:#;" | 2026-11-13|| ||align=left| Ramadan Ondash || ONE The Inner Circle 38, Lumpinee Stadium || Bangkok, Thailand|| || || |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2026-09-12|| Win ||align=left| Suablack Tor.Pran49 || ONE Samurai 3 || Yokohama, Japan || KO (left hook to the body) || 2 || 2:28
|- style="background:#cfc;" | 2026-04-29||Win ||align=left| Johan Ghazali || ONE Samurai 1 || Tokyo, Japan || Decision (unanimous) ||3 ||3:00
|- style="background:#cfc;" | 2025-12-19 || Win ||align=left| Dedduanglek Tded99 || ONE Friday Fights 137, Lumpinee Stadium || Bangkok, Thailand || Decision (unanimous) ||3 ||3:00
|- style="background:#c5d2ea;" | 2025-11-21 ||NC ||align=left| Tagir Khalilov || ONE Friday Fights 134, Lumpinee Stadium || Bangkok, Thailand || Doctor stoppage (eye poke) || 2 || 1:22
|- style="background:#cfc;" | 2025-10-05|| Win ||align=left| Neungphusing Kor.Wuttichai || BOM OUROBOROS 2025 || Yokosuka, Japan || KO (left hook)||1 || 2:33 |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2025-08-22 || Win ||align=left| Pettonglor Sitluangpeenumfon || ONE Friday Fights 121, Lumpinee Stadium || Bangkok, Thailand || TKO (3 knockdowns) || 2||1:6
|- style="background:#cfc;" | 2025-03-23 || Win ||align=left| Yodlekpet Or.Atchariya || ONE 172 || Saitama, Japan || Decision (unanimous) || 3 || 3:00
|- style="background:#cfc;" | 2024-12-20 ||Win ||align=left| Rittidet Sor.Sommai || ONE Friday Fights 92, Lumpinee Stadium || Bangkok, Thailand || TKO (referee stoppage) || 2 || 0:39
|- style="background:#cfc;" | 2024-09-23|| Win ||align=left| Nongbew Jitmuangnon || Muay Thai Pantamit, Thupatemi Stadium || Pathum Thani, Thailand || Decision || 5 || 3:00 |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2024-07-14 || Win ||align=left| Wukong Sitjaroenwit || Rajadamnern World Series Japan || Chiba, Japan || Decision (unanimous) || 3|| 3:00
|- style="background:#cfc;" | 2024-06-09 || Win ||align=left| Thepmangorn FighterMuaythai || BOM 46 || Yokohama, Japan || TKO (3 knockdowns) || 1 || 2:30
|- style="background:#cfc;" | 2024-04-14 || Win ||align=left| Isannua Chotbangsaen || Rajadamnern World Series Japan || Chiba, Japan || Decision (unanimous) || 3 || 3:00
|- style="background:#cfc;" | 2024-03-02 || Win ||align=left| Ibrahim Abou Saleh || Rajadamnern World Series || Bangkok, Thailand || Decision (unanimous) || 3 || 3:00
|- style="background:#cfc;" | 2023-12-23 || Win||align=left| Watcharapon Singhamawynn || Rajadamnern World Series || Bangkok, Thailand || Decision (unanimous) || 3 || 3:00
|- style="background:#cfc;" | 2023-11-26 || Win ||align=left| Takehiko Umezawa || BOM 45 || Yokohama, Japan || TKO (doctor stoppage) || 4 || 3:00
|- style="background:#cfc;" | 2023-08-14|| Win ||align=left| Watcharapon Singhamawynn|| Muay Thai Pantamit, Thupatemi Stadium || Pathum Thani, Thailand || Decision (unanimous) || 5 || 3:00 |- ! style=background:white colspan=9 |
|- style="text-align:center; background:#fbb;" | 2023-06-24|| Loss|| align=left| Paruhatnoi TBMgym || Omnoi Stadium || Samut Sakhon, Thailand || Decision || 5 || 3:00 |- ! style=background:white colspan=9 |
|- style="text-align:center; background:#cfc;" | 2023-04-09|| Win || align=left| Ryota Mawatari || BOM -OUROBOROS 2023- Road to ONE Tournament, Final|| Tokyo, Japan || Decision (unanimous)|| 3 ||3:00
|- style="text-align:center; background:#cfc;" | 2023-01-25|| Win|| align=left| Petchsaenkom YaichueySeaFood|| Muay Thai Palangmai, Rajadamnern Stadium || Bangkok, Thailand || KO (left hook) || 2 || 0:12
|- style="text-align:center; background:#cfc;" | 2022-12-11|| Win || align=left| Takanobu Sano|| BOM 37 - Road to ONE Tournament, Semifinal|| Yokohama, Japan || KO (left hook) || 2 || 2:27
|- style="text-align:center; background:#cfc;" | 2022-10-19|| Win || align=left| Silangern LannaHomestay|| Palangmai, Rajadamnern Stadium|| Bangkok, Thailand || KO (knees) || 3 ||
|- style="text-align:center; background:#cfc;" | 2022-06-26|| Win || align=left| Yuki Morioka|| Suk Wan Kingthong "to challenge"|| Tokyo, Japan || Decision (unanimous)|| 5 ||3:00 |- ! style=background:white colspan=9 |
|- style="text-align:center; background:#cfc;" | 2021-11-07|| Win||align=left| Masayoshi Kunimoto || BOM WAVE 06 – Get Over The COVID-19 || Yokohama, Japan || Decision (unanimous) || 5 ||3:00 |- ! style=background:white colspan=9 |
|- style="text-align:center; background:#cfc;" | 2021-09-26||Win || align=left| Keisuke Miyasaka || BOM – Ouroboros 2021 – || Tokyo, Japan || Decision (unanimous) || 3 ||3:00
|- style="text-align:center; background:#cfc;" | 2021-05-30|| Win || align=left| Riamu Matsumoto|| BOM ～ BOMBERS 001 || Tokyo, Japan || Decision (unanimous)|| 3 || 3:00
|- style="text-align:center; background:#cfc;" | 2021-02-24|| Win|| align=left| Ryu Hanaoka || NO KICK NO LIFE Shin Shou Ungaisouten|| Tokyo, Japan || Decision (majority) || 5 || 3:00
|- style="text-align:center; background:#cfc;" | 2020-12-06||Win || align=left| Tenma || BOM WAVE 03 – Get Over The COVID-19 || Yokohama, Japan || TKO (right cross) || 3|| 3:00 |- ! style=background:white colspan=9 |
|- style="text-align:center; background:#cfc;" | 2020-10-04||Win || align=left| Chikai || BOM WAVE 02 -Get Over The COVID-19- || Yokohama, Japan ||Decision (unanimous) || 5|| 3:00
|- style="text-align:center; background:#cfc;" | 2020-07-19|| Win || align=left| Iori Nakano || Suk Wan Kingthong Rookies || Tokyo, Japan || Decision (unanimous) ||3 || 3:00
|- style="text-align:center; background:#cfc;" | 2019-12-15|| Win || align=left| Rittidet Wor.Wanthawee || Chang MuayThai Kiatpetch Super Fight, OrTorGor3 Stadium || Nonthaburi, Thailand || KO (knee)||1 ||
|- style="text-align:center; background:#cfc;" | 2019-10-31|| Win || align=left| Petchnamchai Siaekviset || Chujaroen Muay Thai, Rajadamnern Stadium || Bangkok, Thailand || KO || 3 ||
|- style="text-align:center; background:#fbb;" | 2019-05-28|| Loss || align=left| Yodbuangam Wisanukolkan || PK.Saenchai + Sor Jor Tongprachin, Lumpinee Stadium || Bangkok, Thailand || Decision ||5 || 3:00
|- style="text-align:center; background:#cfc;" | 2019-02-10|| Win || align=left| Monpichit DaenCentury|| Kiatpetch, Jitmuangnon Stadium || Bangkok, Thailand || TKO || 4 ||
|- style="text-align:center; background:#fbb;" | 2018-12-11|| Loss || align=left| Yokngern Sitkongsiam || PK.Saenchai + Parunchai, Lumpinee Stadium || Bangkok, Thailand || Decision ||5 || 3:00
|- style="text-align:center; background:#cfc;" | 2018-11-13|| Win || align=left| Ekthawikun Moopingaroijungbei|| PK.Saenchai, Lumpinee Stadium || Bangkok, Thailand || KO ||3 ||
|- style="text-align:center; background:#cfc;" | 2018-08-10|| Win || align=left| Ekayut Moopingaroijung|| PK.Saenchai, Lumpinee Stadium || Bangkok, Thailand || Decision ||5 || 3:00
|- style="text-align:center; background:#fbb;" | 2018-02-18|| Loss || align=left| Sarawut Siyorsien|| Suek Muaydee Withithai, Blue Arena || Samut Prakarn, Thailand || Decision ||5 || 3:00
|- style="text-align:center; background:#cfc;" | 2016-08-13||Win || align=left| Danbrapa Nor.Rongresyortong|| Rangsit Stadium || Rangsit, Thailand || Decision ||5 || 3:00
|- style="text-align:center; background:#cfc;" | 2015-08-12|| Win || align=left| || Queen's Birthday || Bangkok, Thailand || || ||
|- style="text-align:center; background:#cfc;"