Kotetsu Boku (26-16-2, 14) was born in Shizuoka, Japan on May 27, 1977. At the age of 24 years on November 26, 2001, he made his professional MMA debut against Marc Duncan, winning the fight via 2nd-round submission.
Boku's last fight was a 3rd-round TKO loss to Rikuto Shirakawa at Rizin 25 - Osaka at age 43 on November 21, 2020. He retired on a 5-fight losing streak.
Some of Kotetsu Boku's best fights have been against Yukio Sakaguchi, Timofey Nastyukhin, Naoki Matsushita, Mitsuo Matsumoto, Alexandre Franca Nogueira, Hermes França and Kohei Yasumi.
Boku has 16 losses on his MMA record.
| # | Date | Opponent | Promotion | Weight | Round | Method | Result |
|---|---|---|---|---|---|---|---|
44 | Nov 21, 2020 43 years, 5 months 26-16-2 (14) | Rikuto Shirakawa | Rizin | FT | 3 | TKO | LOSS Punch and soccer kick |
43 | Aug 10, 2020 43 years, 2 months 26-15-2 (14) | Jin Aoi | Rizin | FT | 3 | UD | LOSS |
42  | Aug 16, 2019 42 years, 2 months 26-14-2 (14) | 33 years, 11 months 9-2 (9) | ONE | FT | 1 | KO | LOSS Punches |
41  | Jan 19, 2019 41 years, 7 months 26-13-2 (14) | 28 years, 5 months 6-3 (6) | ONE | FT | 1 | SUB | LOSS Rear-naked choke |
40  | Dec 9, 2017 40 years, 6 months 26-12-2 (14) | 19 years, 5 months 7-1 (7) | ONE | FT | 1 | KO | LOSS Slam |
39 | Aug 5, 2017 40 years, 2 months 26-11-2 (14) | Eric Kelly | ONE | FT | 3 | TKO | WIN Punches |
38  | Nov 11, 2016 39 years, 5 months 25-11-2 (13) | 26 years, 11 months 10-2 (10) | ONE | FT | 1 | TKO | WIN Doctor stoppage |
37  | May 6, 2016 38 years, 11 months 24-11-2 (12) | 40 years, 4 months 10-4 (5) | ONE | FT | 3 | CKO | LOSS Von flue choke |
36 | Feb 20, 2016 38 years, 8 months 24-10-2 (12) | Vincent Latoel | ONE | FT | 2 | TKO | WIN Elbows and punches |
35 | Nov 13, 2015 38 years, 5 months 23-10-2 (11) | Major Overall | Pride | FT | 2 | TKO | WIN Punch |
34 | May 31, 2015 38 years 22-10-2 (10) | Juntaro Ushiku | Pancrase | FT | 2 | KO | WIN Elbows |
33  | May 2, 2014 36 years, 11 months 21-10-2 (9) | 30 years, 5 months 13-4 (7) | ONE | LT | 3 | UD | LOSS |
32 | Mar 14, 2014 36 years, 9 months 21-9-2 (9) | Arnaud Lepont | ONE | LT | 1 | KO | WIN Punches |
31  | Sep 13, 2013 36 years, 3 months 20-9-2 (8) | 31 years, 2 months 5-4 (5) | ONE | LT | 3 | UD | LOSS |
30  | Apr 5, 2013 35 years, 10 months 20-8-2 (8) | 29 years, 10 months 32-6 (20) | ONE | LT | 2 | SUB | LOSS Rear-naked choke Lost ONE FC lightweight title |
29 | Oct 6, 2012 35 years, 4 months 20-7-2 (8) | Zorobabel Moreira | ONE | LT | 3 | TKO | WIN Punches Won ONE FC lightweight title |
28 | Jul 16, 2012 35 years, 1 months 19-7-2 (7) | Shin Kochiwa | WL | 1 | KO | WIN Punch | |
27  | Jul 18, 2011 34 years, 1 months 18-7-2 (6) | 35 years, 1 months 18-8 (12) | WL | 3 | UD | LOSS For Shooto welterweight title | |
26  | Jan 10, 2011 33 years, 7 months 18-6-2 (6) | 29 years, 7 months 9-4-5 (4) | WL | 3 | UD | WIN | |
25 | May 30, 2010 33 years 17-6-2 (6) | Yoshihiro Koyama | WL | 3 | UD | WIN | |
24 | Jan 30, 2010 32 years, 8 months 16-6-2 (6) | Tony Hervey | KOTC | WL | 3 | UD | WIN |
23  | Nov 23, 2009 32 years, 5 months 15-6-2 (6) | 36 years, 3 months 5-5 (5) | WL | 1 | KO | WIN Punch | |
22 | Sep 22, 2009 32 years, 3 months 14-6-2 (5) | Yusuke Endo | WL | 1 | SUB | LOSS Rear-naked choke For Shooto welterweight title | |
21 | May 10, 2009 31 years, 11 months 14-5-2 (5) | Yutaka Ueda | WL | 1 | TKO | WIN Punches | |
20 | Jan 18, 2009 31 years, 7 months 13-5-2 (4) | Yusuke Endo | WL | 3 | UD | DRAW Majority | |
19  | Mar 15, 2008 30 years, 9 months 13-5-1 (4) | 28 years, 9 months 16-6-1 (10) | Dream | WL | 2 | UD | LOSS |
18 | Dec 1, 2007 30 years, 6 months 13-4-1 (4) | Artur Oumakhanov | WL | 3 | SD | LOSS | |
17  | Sep 8, 2007 30 years, 3 months 13-3-1 (4) | 31 years, 8 months 11-4-2 (9) | WL | 3 | SD | WIN | |
16 | Jun 9, 2007 30 years 12-3-1 (4) | David Gardner | WL | 3 | UD | WIN | |
15 | Mar 17, 2007 29 years, 9 months 11-3-1 (4) | Jarkko Latomaki | WL | 1 | TKO | WIN Punches and elbows | |
14 | Feb 17, 2007 29 years, 8 months 10-3-1 (3) | Kenichiro Togashi | WL | 3 | UD | DRAW Split | |
13  | Aug 5, 2006 29 years, 2 months 10-3 (3) | 28 years, 6 months 12-3-2 (6) | WL | 2 | UD | WIN | |
12  | Sep 7, 2005 28 years, 3 months 9-3 (3) | 31 years 10-4 (9) | WL | 2 | MD | WIN | |
11 | Jan 29, 2005 27 years, 8 months 8-3 (3) | Ryan Bow | WL | 3 | MD | WIN Won Shooto Pacific Rim welterweight title | |
10  | Sep 26, 2004 27 years, 3 months 7-3 (3) | 32 years 10-8-5 (4) | 3 | UD | WIN | ||
9  | Jan 24, 2004 26 years, 7 months 6-3 (3) | 25 years, 1 months 6-3-2 (2) | 3 | UD | WIN | ||
8  | Sep 21, 2003 26 years, 3 months 5-3 (3) | 27 years, 5 months 4-1-4 (0) | 2 | TKO | WIN Punches | ||
7 | Jun 27, 2003 26 years, 1 months 4-3 (2) | Kenichiro Togashi | 1 | SUB | LOSS Armbar | ||
6  | Feb 6, 2003 25 years, 8 months 4-2 (2) | 24 years, 1 months 3-1 (1) | 2 | UD | LOSS | ||
5 | Jul 19, 2002 25 years, 1 months 4-1 (2) | Toniko Junior | 1 | TKO | WIN Punches | ||
4 | May 5, 2002 24 years, 11 months 3-1 (1) | 29 years, 8 months 5-6-5 (2) | 2 | SUB | LOSS Kneebar | ||
3  | Mar 13, 2002 24 years, 9 months 3-0 (1) | 30 years, 7 months 4-6-1 (0) | 2 | UD | WIN | ||
2 | Jan 25, 2002 24 years, 7 months 2-0 (1) | Takuhito Hida | 2 | UD | WIN | ||
1 | Nov 26, 2001 24 years, 5 months 1-0 (1) | Marc Duncan | 2 | SUB | WIN Armbar |
