Ryuya Okuwaki (born 26 August 2000), also known as Ryuya Eiwasportsgym in Thailand, is a Japanese Muay Thai fighter. He is the former Rajadamnern, WPMF and IBF Muaythai World mini flyweight champion.
He is the former WMC World Pinweight champion.
Okuwaki made his professional debut against Hanuman Sor. Walitar in June 2016, winning the fight by unanimous decision. He would win four of his next six fights, with his 7-2 record earning him a chance to fight Newjorwan Pumpanmuang for the WMC World Pinweight title. Okuwaki defeated Newjorwan by unanimous decision.
Okuwaki lost his next fight against Phetdeet Wor. Sanprapai by decision, but would rebounded with a two fight win streak. In April 2019, he fought a rematch with Newjorwan Pumpanmuang, for the Muay Siam Isan 105lbs title. Okuwaki once again defeated Newjorwan, this time with a second round head kick knockout. Two months later, Okuwaki fought Petchdet Wor.Sangprapai for the vacant WBC Muaythai World 105lbs title, losing the fight by unanimous decision.
In September 2019, Okuwaki was scheduled to fight Mungkornyok AnnyMuayThai for the Rajadamnern Stadium 105lbs title. He defeated Mungkornyok by unanimous decision.
Okuwaki fought Phetsila MTM Academy for the WPMF World Mini Flyweight title at BOM 2-6. He lost the fight by majority decision. He was once again scheduled to fight for the fight same title two months later, against Udonnoi Bestbet 9955. Okuwaki won the fight by a fourth round knockout.
On July 28, 2021 Okuwaki faced Riku Kazushima at RISE 151. The fight was declared a majority draw despite Kazushima scoring a knockdown in the first round. The fight did not go to an extension round as Kazushima accepted the bout on short notice.
Okuwaki faced Ryuto Oinuma at Rizin 31 - Yokohama on October 24, 2021. He won the bout via majority decision.
Okuwaki challenged Jigsaw NayoksoywiangyongLamphun for his Rajadamnern Stadium Flyweight title on February 15, 2025, on a Rajadamnern World Series event. He lost the fight by unanimous decision.
Okuwaki fought Thanupit on April 20, 2025. He won in the 2nd round via Technical Knockout.
On October 5, 2025 Okuwaki defended his belt against Waewwaow Wor.Wangprom. He won after 5 rounds via unanimous decision.
Awards
|- style="background:#;" | 2026-04-05|| ||align=left| Detchpichai Navyandaman || BOM 50 || Yokohama, Japan || || || |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2025-12-19 || Win||align=left| Pet Suanluangrodyok || ONE Friday Fights 137, Lumpinee Stadium || Bangkok, Thailand || Decision (Unanimous) ||3 ||3:00 |- style="background:#cfc;" | 2025-10-05|| Win||align=left| Waewwaow Wor.Wangprom|| BOM OUROBOROS 2025 || Yokosuka, Japan ||Decision (Unanimous) || 5 || 3:00 |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2025-08-22 || Win||align=left| Nuaphet Kelasport || ONE Friday Fights 121, Lumpinee Stadium || Bangkok, Thailand || KO (High kick) ||2 ||2:22 |- style="background:#cfc;" | 2025-06-15 || Win ||align=left| Huakaewhuawaen JackyGym || Road to RWS Japan || Tokyo, Japan || KO (Punches) || 2 ||1:40 |- style="background:#cfc;" | 2025-05-11|| Win ||align=left| Kaenubon Por.Lakboon|| BOM x Space One Japan|| Tokyo, Japan ||Decision (Unanimous) || 3 || 3:00 |- style="background:#cfc;" | 2025-04-20 || Win ||align=left| Thanupit SiriluckMuaythai || Road to Rajadamnern || Tokyo, Japan || KO (Left hook to the body) || 2 || 2:46 |- style="background:#fbb;" | 2025-02-15 || Loss ||align=left| Jigsaw NayoksoywiangyongLamphun || Rajadamnern World Series || Bangkok, Thailand || Decision (Unanimous) || 5 || 3:00 |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2024-12-01 || Win ||align=left| Kampanthong Chor.Hapayak || Rajadamnern World Series Japan || Yokohama, Japan || Decision (Unanimous) || 3 || 3:00 |- style="background:#cfc;" | 2024-10-13 || Win ||align=left| Proeung Sochet || BOM 49 || Tokyo, Japan || TKO (3 Knockdowns) ||1 ||1:36 |- style="background:#cfc;" | 2024-09-04 || Win ||align=left| Sivarat Wor.Rinthida || BOM 47 || Yokohama, Japan || KO (Punches)||1 ||2:44 |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2024-07-14 || Win ||align=left| Kaewnaka OrBorJor.NakhonPhanom || Rajadamnern World Series Japan || Chiba, Japan || Decision (Unanimous) || 3 || 3:00 |- style="background:#cfc;" | 2024-06-22 || Win ||align=left| Klaijaenglek Sit Klaijaeng || Rajadamnern World Series || Bangkok, Thailand || KO (Left hook to the body) || 1 ||2:25 |- style="background:#cfc;" | 2024-04-14 || Win ||align=left| Kotchasit Tasayasat || Rajadamnern World Series Japan || Chiba, Japan || Decision (Unanimous)|| 3||3:00 |- style="background:#fbb;" | 2024-03-02 || Loss||align=left| Kotchasit Tasayasat || Rajadamnern World Series || Bangkok, Thailand || Decision (Unanimous)|| 3 ||3:00 |- style="background:#cfc;" | 2023-12-23 ||Win ||align=left| Peyman Zofaghari || Rajadamnern World Series || Bangkok, Thailand || TKO (Referee stoppage) || 3 || 2:43 |- style="background:#fbb;" | 2023-10-28 || Loss ||align=left| Detchpichai NavyAndaman || Rajadamnern World Series || Bangkok, Thailand || Decision (Unanimous) || 3 || 3:00 |- style="background:#cfc;" | 2023-08-14|| Win||align=left| Superchamp WoodyChonburiPraleasing|| Muay Thai Pantamit, Thupatemi Stadium || Pathum Thani, Thailand || Decision (Unanimous)|| 5 ||3:00 |- ! style=background:white colspan=9 |
|- style="background:#c5d2ea;" | 2023-07-09|| Draw||align=left| Harn Sor.Sakarin|| BOM 41|| Tokyo, Japan || Decision (Split)|| 5 ||3:00 |- style="background:#cfc;" | 2023-06-21|| Win||align=left| Rifdean ChaoraiOy|| Muay Thai Palangmai, Rajadamnern Stadium || Bangkok, Thailand || TKO (Knees)|| 2 ||
|- style="background:#cfc;" | 2023-04-09 || Win || align=left| Sunday UFA Boomdeksien || BOM Ouroboros 2023 || Tokyo, Japan || KO (Left hook to the body) || 3||2:39 |- style="background:#cfc;" | 2022-12-11 || Win || align=left| Newang KofightThailand|| BOM 37 || Yokohama, Japan || KO (Low kicks) || 1 || 0:42 |- style="text-align:center; background:#cfc" | 2021-12-12|| Win ||align=left| Yuzuki Sakai || RISE 153 || Tokyo, Japan ||Decision (Unanimous) || 3 ||3:00 |- style="text-align:center; background:#cfc;" | 2021-11-14|| Win ||align=left| Koichi Sakamoto || Super Bigbang 2021 || Yokohama, Japan || KO (Flying Knee) || 1 || 2:14 |- style="background:#cfc;" | 2021-10-24|| Win || align=left| Ryuto Oinuma || Rizin 31 - Yokohama || Yokohama, Japan || Decision (Majority)|| 3 || 3:00 |- style="text-align:center; background:#cfc;" | 2021-09-26|| Win || align=left| Tomo || BOM â ouroboros 2021 â || Tokyo, Japan || Decision (Unanimous) || 3 ||3:00 |- style="text-align:center; background:#c5d2ea;" | 2021-07-28|| Draw ||align=left| Riku Kazushima || RISE 151 || Tokyo, Japan || Decision (Majority)|| 3 ||3:00 |- style="text-align:center; background:#cfc;" | 2021-04-11|| Win ||align=left| Masa Bravely|| BOM WAVE 04 â Get Over The COVID-19 || Yokohama, Japan || Decision (Unanimous) || 5 || 3:00 |- style="text-align:center; background:#cfc;" | 2021-02-28|| Win ||align=left| Shinichi Watanabe || RISE Eldorado 2021 || Yokohama, Japan || Decision (Unanimous)|| 3||3:00 |- style="text-align:center; background:#cfc;" | 2020-12-06|| Win ||align=left| Hidetora Abe || The Battle Of Muay Thai WAVE 03 - Get over the COVID-19 || Yokohama, Japan || TKO || 1||1:40 |- style="text-align:center; background:#cfc;" | 2020-10-04|| Win ||align=left| Ryunosuke Wor.Wanchai || The Battle Of Muay Thai Wave 02 Get over the COVID-19 || Yokohama, Japan || Decision (Unanimous) || 5 || 3:00 |- style="text-align:center; background:#cfc;" | 2020-02-09||Win||align=left| Udonnoi Bestbet 9955 || The Battle Of Muay Thai SEASON II vol.7 || Tokyo, Japan ||KO (Right Hook) || 4 || 0:57 |- ! style=background:white colspan=9 | |- style="text-align:center; background:#FFBBBB;" | 2019-12-08||Loss||align=left| Petchsila MTM Academy || BOM 2-6ï½ÂTHE Battle Of Muaythai SEASON II vol.6 || Tokyo, Japan || Decision (Majority) || 5 || 3:00 |- ! style=background:white colspan=9 | |- style="text-align:center; background:#cfc;" | 2019-10-31 || Win ||align=left| Sangarthit Sitchefboontham || Chujaroen Muay Thai, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- style="text-align:center; background:#CCFFCC;" | 2019-09-09|| Win ||align=left| Mungkornyok AnnyMuayThai || Chujaroen Muay Thai, Rajadamnern Stadium || Bangkok, Thailand || Decision (Unanimous)|| 5 || 3:00 |- ! style=background:white colspan=9 | |- style="text-align:center; background:#CCFFCC;" | 2019-07-18|| Win ||align=left| Boonlai Sidchefboontham || Chef Boontham, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- ! style=background:white colspan=9 | |- style="text-align:center; background:#FFBBBB;" | 2019-06-01|| Loss||align=left| Petchdet Wor.Sangprapai || BOM -The Battle Of Muay Thai- season II vol.2 || Yokohama, Japan || Decision (Unanimous)|| 5 || 3:00 |- ! style=background:white colspan=9 | |- style="text-align:center; background:#CCFFCC;" | 2019-04-14|| Win ||align=left| Newjorwan Pumpanmuang || BOM2-1 - The Battle Of Muay Thai Season II vol.1 - || Yokohama, Japan || KO (Left High Kick)|| 2 || 1:45 |- ! style=background:white colspan=9 | |- style="text-align:center; background:#CCFFCC;" | 2019-03-16|| Win ||align=left| Yodchingchai TalingngamMuaythai || Suek Jao Muay Thai, Siam Omnoi Stadium || Samut Sakhon, Thailand ||Decision (Unanimous) || 5 || 3:00 |- style="text-align:center; background:#fbb;" | 2019-02-07|| Loss ||align=left| Kaotam Sitchefboontham || Chef Boontham, Rajadamnern Stadium || Bangkok, Thailand ||Decision || 5 || 3:00
|- style="text-align:center; background:#CCFFCC;" | 2018-12-09|| Win ||align=left| Joker Phetsimean || The Battle Of Muaythai 20 || Yokohama, Japan ||Decision (Unanimous) || 5 || 3:00 |- style="text-align:center; background:#FFBBBB;" | 2018-08-29|| Loss||align=left| Petchdet Wor.Sangprapai || Suk Wan Kinthong Muay Thai Super Fight || Tokyo, Japan ||Decision || 5 || 3:00 |- style="text-align:center; background:#CCFFCC;" | 2018-04-08|| Win ||align=left| Newjorwan Pumpanmuang || Battle Of Muaythai 17 || Yokohama, Japan || Decision (Unanimous)|| 5 || 3:00 |- ! style=background:white colspan=9 | |- style="text-align:center; background:#CCFFCC;" | 2017-11-29|| Win ||align=left| Chalamkaw Sunkilathasao || Petchyindee, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- style="text-align:center; background:#fbb;" | 2017-08-28|| Loss||align=left| Chokpreecha Fukenoodle || Petchyindee, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- style="text-align:center; background:#CCFFCC;" | 2017-07-26|| Win ||align=left| Chokpreecha Fukenoodle || Petchyindee, Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- style="text-align:center; background:#CCFFCC;" | 2017-05-14|| Win ||align=left| Maimongkon Phutiananbangna || Petchyindee, Rajadamnern Stadium || Bangkok, Thailand || KO || 3 || |- style="text-align:center; background:#CCFFCC;" | 2017-01-22|| Win ||align=left| Nawee Aor.Electric || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="text-align:center; background:#FFBBBB;" | 2016-10-09|| Loss||align=left| Sonlam 13LianResort || Suk Wanchai MuayThai Super Fight || Tokyo, Japan || Decision (Unanimous)|| 3 || 3:00 |- style="text-align:center; background:#CCFFCC;" | 2016-06-19|| Win ||align=left| Hanuman Sor. Walitar || Wanchai+Kingthong MuayThai Super Fight || Tokyo, Japan || Decision (Unanimous)|| 3 || 3:00 |- style="text-align:center; background:#fbb;" | 2016-04-16|| Loss||align=left| Phetsuthat Paesaisee || Suek Jao Muaythai, Siam Omnoi Stadium || Samut Sakhon, Thailand || Decision || 5 || 3:00 |- | colspan=9 | Legend: