Rui Okubo (Japanese: 大久保 琉唯, Okubo Rui, born September 12, 2004) is a Japanese kickboxer. He is the former Krush Flyweight (-51kg) champion and the 2024 K-1 Super bantamweight (-55 kg) World Tournament runner-up.

As of April 2024 he was the 10th ranked strawweight (-54 kg) kickboxer in the world by Combat Press.^[1]

As an amateur Okubo amassed a record of 145 wins, 18 losses, 3 draws and captured over 40 titles. During 2021, his last year of competition before turning professional, Okubo won the two most prestigious titles of Japanese amateur kickboxing, the Japan Cup in March and the K-1 Koshien tournament in August.^[2] He won four fights in one day during both tournaments. His Koshien success secured him a professional debut with the K-1 promotion.^[3] He was awarded the Best Amateur Athlete Award at the 2021 K-1 Awards Show.^[4]

Okubo made his professional debut on February 27, 2022, at K-1 World GP 2022 Japan against Shohei Nishibayashi. He won the fight by unanimous decision.^[5]

For his second professional fight, Okubo was invited on the exceptional card THE MATCH 2022 at the Tokyo Dome, on June 19, 2022, where he faced Ryujin Nasukawa, the younger brother of the card headlining star Tenshin Nasukawa. Okubo won the fight by unanimous decision.^[6]

On September 24, 2022, Okubo took part in a 4-man tournament at Krush 141 with the inaugural Krush Flyweight (-51kg) title at stake. In the semifinals he rematched Shohei Nishibayashi and defeated him once again by unanimous decision.^[7] Okubo advanced to the final where he faced Daina. The fight was declared a draw after 3 rounds and went to an extension round which Okubo won by split decision to capture the inaugural title.^[8]

Okubo vacated his Krush flyweight title on April 14, 2023, in order to move up in weight.^[9] Okubo made his debut at 53 kg on June 3, 2023, at K-1 World GP 2023 in Yokohama against Ryunosuke Saito. He lost the fight by extension round decision.^[10]

On October 21, 2023, Okubo returned to krush to face Eito Kurokawa at Krush 154. He won the fight by unanimous decision.^[11]

Rui Okubo faced Kazuki Miburo at K-1 World MAX 2024 - World Tournament Opening Round on March 20, 2024.^[12] He won the fight by unanimous decision.^[13]

Okubo was announced as being part of an 8-man world tournament in the 55 kg division that would see its first round take place on July 7, 2024, at K-1 World MAX 2024 - World Championship Tournament Final.^[14] Okubo faced Zhao Zhengdong in the tournament quarterfinals at K-1 World MAX 2024 on July 7, 2024.^[15] He won the fight by unanimous decision, with two scorecards of 30–29 and one scorecard of 30–28 in his favor.^[16] Okubo faced the two-time K-1 super bantamweight title challenger Masashi Kumura in the final four of the tournament, which was held at K-1 World MAX 2024 on September 29, 2024.^[17] He won the fight by unanimous decision, with all three judges awarding him a 30–29 scorecard.^[18] Okubo faced the reigning K-1 super bantamweight champion Akihiro Kaneko in the tournament finals. He lost the fight by a second-round knockout.^[19]

• Krush
  • 2022 Krush Flyweight (-51kg) Champion

• K-1
  • 2024 K-1 Super Bantamweight (-55kg) World Tournament Runner-up

Awards

• 2021 K-1 Awards Best Amateur Athlete
• 2022 K-1 Awards Rookie of the Year^[20]

Professional Kickboxing record

9 Wins (0 (T)KO's), 2 Losses, 0 Draw, 0 No Contest
Date	Result	Opponent	Event	Location	Method	Round	Time
2025-02-09		Koshiro Takemi	K-1 World MAX 2025	Tokyo, Japan
2024-12-14	Win	Riamu	K-1 World Grand Prix 2024 Final	Tokyo, Japan	Decision (Unanimous)	3	3:00
2024-09-29	Loss	Akihiro Kaneko	K-1 World MAX 2024 - 55kg World Tournament, Final	Tokyo, Japan	KO (Low kick)	2	0:26
For the 2024 K-1 Super Bantamweight (-55kg) World Tournament title.
2024-09-29	Win	Masashi Kumura	K-1 World MAX 2024 - 55kg World Tournament, Semifinals	Tokyo, Japan	Decision (Unanimous)	3	3:00
2024-07-07	Win	Zhao Zhengdong	K-1 World MAX 2024 - 55kg World Tournament, Quarterfinals	Tokyo, Japan	Decision (Unanimous)	3	3:00
2024-03-20	Win	Kazuki Miburo	K-1 World MAX 2024 - World Tournament Opening Round	Tokyo, Japan	Decision (Unanimous)	3	3:00
2023-10-21	Win	Eito Kurokawa	Krush 154	Tokyo, Japan	Decision (Unanimous)	3	3:00
2023-06-03	Loss	Ryunosuke Saito	K-1 World GP 2023 in Yokohama	Yokohama, Japan	Ext.R Decision (Split)	4	3:00
2022-09-24	Win	Daina	Krush 141 - Flyweight Championship Tournament Final	Tokyo, Japan	Ext.R Decision (Split)	4	3:00
Wins the inaugural Krush Flyweight (-51.5kg) title.
2022-09-24	Win	Shohei Nishibayashi	Krush 141 - Flyweight Championship Tournament Semi Final	Tokyo, Japan	Decision (Unanimous)	3	3:00
2022-06-19	Win	Ryujin Nasukawa	THE MATCH 2022	Tokyo, Japan	Decision (Unanimous)	3	3:00
2022-02-27	Win	Shohei Nishibayashi	K-1 World GP 2022 Japan	Tokyo, Japan	Decision (unanimous)	3	3:00
Legend:   Win   Loss   Draw/No contest   Notes

Amateur Kickboxing record 145 Wins (30 (T)KO's), 18 Losses, 3 Draws Date Result Opponent Event Location Method Round Time 2021-09-12 Win Gentaro Iwamoto K-1 Amateur All Japan, A-class -55 kg, Final Tokyo, Japan Decision (Unanimous) 1 2:00 Wins K-1 All Japan A-class -55kg title. 2021-09-12 Win Haruto Matsumoto K-1 Amateur All Japan, A-class -55 kg, Semi Final Tokyo, Japan Decision (Unanimous) 1 2:00 2021-08-29 Win Ryunosuke Saito 2021 K-1 Koshien Tournament -55 kg, Final Tokyo, Japan Decision (Majority) 1 3:00 Wins 2021 K-1 Koshien -55kg Tournament title. 2021-08-29 Win Ryuki Yasuo 2021 K-1 Koshien Tournament -55 kg, Semi Finals Tokyo, Japan Decision (Unanimous) 1 2:00 2021-08-29 Win Takumi Yoshimura 2021 K-1 Koshien Tournament -55 kg, Quarter Finals Tokyo, Japan Decision (Unanimous) 1 2:00 2021-08-29 Win Yuto Kobayashi 2021 K-1 Koshien Tournament -55 kg, 1/8 Final Tokyo, Japan KO 1 2021-07-11 Win Ryunosuke Saito K-1 Koshien 2021 East Japan Tournament -55 kg, Final Tokyo, Japan Decision (Split) 1 2:00 Qualifies for the 2021 K-1 Koshien -55kg Tournament. 2021-07-11 Win Riku Otsu K-1 Koshien 2021 East Japan Tournament -55 kg, Semi Final Tokyo, Japan Decision (Unanimous) 1 2:00 2021-07-11 Win Eito Kurokawa K-1 Koshien 2021 East Japan Tournament -55 kg, Quarter Final Tokyo, Japan Decision (Unanimous) 1 2:00 2021-07-11 Win Mikito Jouchi K-1 Koshien 2021 East Japan Tournament -55 kg, 1/8 Final Tokyo, Japan Decision (Unanimous) 1 2:00 2021-05-16 Win Gentaro Iwamoto K-1 Amateur All Japan Selection, A-class -55 kg, Final Tokyo, Japan Decision (Unanimous) 1 2:00 2021-05-16 Win Takeru Itabashi K-1 Amateur All Japan Selection, A-class -55 kg, Semi Final Tokyo, Japan Decision (Unanimous) 1 2:00 2021-04-11 Win Ryuki Yasuo 10th All Japan K-1 Amateur, B-class -55 kg Tournament, Final Tokyo, Japan Decision (Unanimous) 1 2:00 Wins K-1 Amateur All Japan B-class -55kg title. 2021-04-11 Win Tadashi Nakamura 10th All Japan K-1 Amateur, B-class -55 kg Tournament, Semi Final Tokyo, Japan KO (High Kick) 1 2021-03-20 Win Tenshi Matsumoto Dageki Kakutougi Japan Cup 2021, Final Tokyo, Japan Decision (Unanimous) 2 2:00 Wins 2021 Japan Cup -55kg title. 2021-03-20 Win Shuri Sakayori Dageki Kakutougi Japan Cup 2021, Semi Final Tokyo, Japan Ext.R Decision (Unanimous) 2 2:00 2021-03-20 Win Toki Oshika Dageki Kakutougi Japan Cup 2021, Quarter Final Tokyo, Japan Decision (Unanimous) 1 3:00 2021-03-20 Win Hyo Tsutsumi Dageki Kakutougi Japan Cup 2021, First Round Tokyo, Japan Decision (Uannimous 1 3:00 2021-02-21 Win Toki Oshika SMASHERS 2021 Tokyo, Japan Decision (Unanimous) 2 2:00 2020-11-08 Win Yuta Shinbo K-1 Amateur Challenge 34, B-class Tournament -55 kg Final Tokyo, Japan Decision 1 2:00 2020-11-08 Win Shura Shigihara K-1 Amateur Challenge 34, B-class Tournament -55 kg Semi Final Tokyo, Japan Decision 1 2:00 2020-11-08 Win Rairo Shiratori K-1 Amateur Challenge 34, B-class Tournament -55 kg Quarter Final Tokyo, Japan TKO 1 2019-08-24 Win Gento Shimoji 5th All Japan WBC Muay Thai Jr League, Final Tokyo, Japan Decision Wins All Japan WBC Muay Thai Jr League -45kg title. 2019-08-24 Win Hiroto Hayashi 5th All Japan WBC Muay Thai Jr League, Semi Final Tokyo, Japan Decision 2019-08-24 Win Taison Maeda 5th All Japan WBC Muay Thai Jr League, Quarter Final Tokyo, Japan Decision 2019-07-28 Win Ryushin Yasuno MuayThaiOpen 45 Tokyo, Japan TKO Wins MuayThaiOpen Amateur -45kg title. 2019-07-21 Win Toki Oshika NJKF Explosion 22, WBC Muay Thai Jr league Selection Final Tokyo, Japan Decision 2 1:30 2019-07-21 Win Taison Maeda NJKF Explosion 22, WBC Muay Thai Jr league Selection Semi Final Tokyo, Japan Decision 2 1:30 2019-07-14 Win Aiki Oshika Bigbang Amateur 51 Tokyo, Japan Decision 3 1:30 Wins Bigbang -45kg title. 2019-06-16 Win Kokoro Wakahara WPMF Amateur 108 Tokyo, Japan KO 1 2019-04-28 Win Daiki Nakano National Junior Kickboxing 16 Tokyo, Japan KO 1 2019-04-28 Win National Junior Kickboxing 16 Tokyo, Japan 2019-03-31 Win Kokoro Wakahara SMASHERS 199 Japan KO 2 1:02 2019-03-24 Win Eito Sanpei TENKAICHI Amateur vol.4 Tokyo, Japan KO 1 1:02 Defends TENKAICHI -45kg title. 2019-03-10 Win NJKF Explosion 20 Tokyo, Japan Forfeit Wins NJKF Explosion U-15 -45kg title. 2019-02-24 Loss Sora Sugiyama MuayThaiOpen 42 Tokyo, Japan Decision For the MuayThaiOpen Amateur -45kg title. 2019-02-10 Win Tesshin Takeda WPMF Amateur 106 Tokyo, Japan Decision 2019-01-20 Win Takuto Kobayashi NJKF Explosion 19 Tokyo, Japan Decision 2 1:30 2018-12-09 Win Kosei Tanaka NJKF Explosion 18 Tokyo, Japan KO 1 2018-10-20 Draw Hiroto Hayashi KROSS×OVER 4 Tokyo, Japan Decision 2 2:00 2018-10-14 Win Riamu Matsumoto NJKF Explosion 17 Atsugi, Japan Decision 3 1:30 Wins NJKF Explosion U-15 -40kg title. 2018-08-05 Win Riamu Matsumoto 4th All Japan WBC Muay Thai Jr League, Final Tokyo, Japan Decision Wins All Japan WBC Muay Thai Jr League -37kg title. 2018-08-05 Win Sento Ito 4th All Japan WBC Muay Thai Jr League, Semi Final Tokyo, Japan Decision 2018-07-22 Win Ryoma Nagai MuayThaiOpen 42 Tokyo, Japan TKO Wins MuayThaiOpen Amateur -40kg title. 2018-07-08 Win Riamu Matsumoto NJKF Explosion 16, WBC Muay Thai Jr league Selection Final Matsudo, Japan Decision 2 1:30 2018-07-08 Win Raisei Hakkaku NJKF Explosion 16, WBC Muay Thai Jr league Selection Semi Final Matsudo, Japan Decision 2 1:30 2018-07-08 Win Yuto Nagasu NJKF Explosion 16, WBC Muay Thai Jr league Selection Quarter Final Matsudo, Japan Decision 2 1:30 2018-06-03 Loss Shimon Yoshinari WPMF Amateur 101 Tokyo, Japan Decision Loses WPMF M-ONE -40kg title. 2018-05-13 Win Hajime Yoshida SMASHERS 194 Tokyo, Japan Decision (Unanimous) 3 1:30 Wins SMASHERS -40kg title. 2018-04-15 Win Sho Osano NJKF Explosion 15 Atsugi, Japan Decision 2 1:30 2018-04-08 Win Aiki Oshika Bigbang Amateur 45 Tokyo, Japan Decision 2 1:30 Wins Bigabng -37kg title. 2018-04-01 Win Atsuki Bravely Gym WPMF Amateur 100 Tokyo, Japan Decision Wins WPMF Amateur -40kg title. 2018-03-25 Loss Taison Maeda SMASHERS 193 Tokyo, Japan Decision (Unanimous) 2 1:30 2018-03-11 Win Sho Osano Shootboxing Amateur 20 Tokyo, Japan Decision 2 1:30 2018-03-04 Win Aiki Oshika Windy Super Fight 8, Final Tokyo, Japan Decision (Unanimous) 3 2:00 Wins Windy Super Fight Kick -36kg title. 2018-03-04 Win Ryusei Hori Windy Super Fight 8, Semi Final Tokyo, Japan Decision (Majority) 2 1:30 2018-02-11 Loss Shimon Yoshinari Muay Thai Super Fight Suk Wan Kingtong vol.10 Tokyo, Japan Decision 2 2:00 2018-02-04 Win Riamu Matsumoto NJKF Explosion 14 Tokyo, Japan Decision 2 1:30 2018-01-21 Win Toki Oshika SMASHERS 192 Tokyo, Japan Decision (Unanimous) 2 1:30 2018-01-23 Win Riamu Matsumoto SMASHERS 192 Tokyo, Japan Decision (Unanimous) 2 1:30 2017-12-17 Win Daiki Kobayashi Shootboxing Amateur All Japan Championship Tokyo, Japan Decision 2 2:00 Wins Shootboxing All Japan -45kg title. 2017-11-25 Win Shimon Yoshinari WPMF Amateur 98 Tokyo, Japan Decision Wins WPMF -40kg title. 2017-09-24 Draw Takuma Urata SMASHERS 189 Tokyo, Japan Decision 2 1:30 2017-09-18 Win Kouken WPMF Amateur 96 Tokyo, Japan KO 2 2017-08-07 Win Riamu Matsumoto 3rd All Japan WBC Muay Thai Jr League Tournament, Final Tokyo, Japan Decision Wins All Japan WBC Muay Thai Jr League -34kg title. 2017-08-07 Win Teru Sugiura 3rd All Japan WBC Muay Thai Jr League Tournament, Semi Final Tokyo, Japan Decision 2017-07-16 Win Ryoma Nagai Suk Wan Kingthong Real Champion Tournament, Final Tokyo, Japan KO 2 Wins Real Champion Tournament -34kg title. 2017-07-09 Win Seiya Sekiguchi MuayThaiOpen 39 Tokyo, Japan Decision Defends MuayThaiOpen Amateur -35kg title. 2017-07-02 Win Riamu Matsumoto NJKF Explosion 11 Japan Decision 3 1:30 Wins NJKF Explosion U-15 -34kg title. 2017-06-28 Win Akito Kinoshita SMASHERS 188, Final Tokyo, Japan Decision (Unanimous) 2 1:30 2017-06-28 Win Seiya Sekiguchi SMASHERS 188, Semi Final Tokyo, Japan Decision (Unanimous) 2 1:30 2017-06-18 Loss Shimon Yoshinari WPMF Amateur 94 Tokyo, Japan Decision Loses WPMF -35kg title. 2017-05-28 Win Hinata Tanabe SMASHERS 187 Tokyo, Japan KO 2 0:30 Wins SMASHERS -35kg title. 2017-04-16 Win Ryushin Yasuno NJKF Explosion 10 Japan Decision 2 1:30 2017-04-02 Win Ryusei Shimizu MuayThaiOpen 38 Tokyo, Japan TKO Wins MuayThaiOpen Amateur -35kg title. 2017-03-20 Win Daiya Oshikawa WPMF Amateur 92 Tokyo, Japan Decision Defends WPMF -35kg title. 2017-02-12 Win Aiji Kobayashi NJKF Explosion 8, Champpionship Tournament Final Tokyo, Japan Decision 2 1:30 Wins NJKF Explosion -34kg title. 2017-02-12 Win Riamu Matsumoto NJKF Explosion 8, Champpionship Tournament Semi Final Tokyo, Japan Decision 2 1:30 2017-02-12 Win Arashi Sakamoto NJKF Explosion 8, Champpionship Tournament Quarter Final Tokyo, Japan 2017-01-22 Win Takumu Ishiwata Windy Super Fight 5 Tokyo, Japan Decision (Unanimous) 3 2:00 Wins Windy Super Fight Kick -33kg title. 2016-12-18 Win Sora Echizen WPMF Amateur 90 Tokyo, Japan Decision Wins WPMF -35kg title. 2016-11-23 Win Sora Echizen WPMF Amateur 89, Next Challenger Tournament Final Tokyo, Japan 2016-11-23 Win Shota Kunioka WPMF Amateur 89, Next Challenger Tournament Semi Final Tokyo, Japan 2016-10-30 Loss Yosuke Uchida Windy Super Fight 4 Tokyo, Japan Ext.R Decision (Split) 4 2:00 For the Windy Super Fight Kick -33kg title. 2016-10-09 Win Takumu Ishiwata Suk Wan Kinghtong Amateur, Real Champion Tournament Final Tokyo, Japan Decision (Unanimous) Wins Real Champion Tournament -30kg title. 2016-10-09 Win Sora Sugiyama Suk Wan Kinghtong Amateur, Real Champion Tournament Semi Final Tokyo, Japan 2016-10-09 Win Koushi Soga Suk Wan Kinghtong Amateur, Real Champion Tournament Quarter Final Tokyo, Japan 2016-09-04 Win Hinata Tanabe SMASHERS 183 Japan KO 1 1:12 Defends SMASHERS -30kg title. 2016-07-23 Loss Shimon Yoshinari 2nd All Japan WBC Muay Thai Jr League Tournament, Final Tokyo, Japan Ext.R Decision 3 For the All Japan WBC Muay Thai Jr League -31kg title. 2016-07-23 Win Ryuta Suekuni 2nd All Japan WBC Muay Thai Jr League Tournament, Semi Final Tokyo, Japan Decision 2016-06-19 Win Ryoma Nagai WPMF Amateur Tokyo, Japan KO Defends WPMF -30kg title. 2016-06-05 Win Takumu Ishiwata BOM Amateur 15, Final Yokohama, Japan Decision 2 2:00 2016-06-05 Win Sena Ohno BOM Amateur 15, Semi Final Yokohama, Japan Decision 2 2:00 2016-05-15 Win Aiji Kobayashi NJKF Explosion 5 Tokyo, Japan Decision 2 1:30 Wins NJKF Explosion -31kg title. 2016-04-29 Win Shoki Hoshikubo SMASHERS 179 Tokyo, Japan Decision (Unanimous) 3 1:30 Defends SMASHERS -30kg title. 2016-04-03 Win Kona Aiharai Amateur REBELS - Blow Cup Tournament -30 kg, Final Tokyo, Japan Forfeit Wins REBELS BLOW CUP -30kg title. 2016-04-03 Win Seiya Sekiguchi Amateur REBELS - Blow Cup Tournament -30 kg, Semi Final Tokyo, Japan Decision (Unanimous) 2016-04-03 Win Sara Kadowaki Amateur REBELS - Blow Cup Tournament -30 kg, Quarter Final Tokyo, Japan Decision (Unanimous) 2016-03-21 Win WPMF Amateur Tokyo, Japan Wins WPMF -30kg title. 2016-03-20 Win Sara Kadowaki SMASHERS 178 Tokyo, Japan Decision (Majority) 2 1:30 Wins SMASHERS -30kg title. 2016-03-13 Win Taiju Nozaki Muay Lok Tokyo, Japan Decision 2 2:00 2016-02-14 Win WMPF Amateur 83, Final Tokyo, Japan 2016-02-14 Win Sora Sugiyama WMPF Amateur 83, Semi Final Tokyo, Japan 2016-02-07 Win Takuma Urata NJKF Explosion 4 Japan Decision 3 1:30 2015-12-12 Loss Shimon Yoshinari JAKF "SMASHERS Champion's Carnival 2015" Tokyo, Japan Decision (Unanimous) 2 1:30 For the SMASHERS -30kg title. 2015-12-06 Win Daiki Nakano Kokusai Junior Kickboxing Championship 8 Saitama, Japan Decision 2015-08-30 Win Momu Tsukamoto All Japan WBC Muay Thai Jr League, Final Tokyo, Japan Decision Wins All Japan WBC Muay Thai Jr League Elementary School -28kg title. 2015-07-05 Win Ryugo Hori NJKF Explosion Tokyo, Japan Decision 2 1:30 2015-04-19 Loss Ryu Hanaoka SMASHERS Wings Tokyo, Japan Decision (Unanimous) Legend:   Win   Loss   Draw/No contest   Notes

• K-1 World GP Japan profile