Kotetsu Boku has 16 losses against 16 opponents on his MMA record. For a list of Boku's best fights, refer to "Best fights of Kotetsu Boku".
On November 21, 2020 Kotetsu Boku faced off against Rikuto Shirakawa in a featherweight bout at age 43. He was coming in with a record of 26-16-2 (14). Boku lost the fight via 3rd-round TKO.
On August 10, 2020 Kotetsu Boku faced off against Jin Aoi in a featherweight bout at age 43. He was coming in with a record of 26-15-2 (14). Boku lost the fight via 3-round unanimous decision.
On August 16, 2019 Kotetsu Boku faced off against Thanh Le in a featherweight bout at age 42. He was coming in with a record of 26-14-2 (14), and Le was 33 years old and with a record of 9-2 (9). Boku lost the fight via 1st-round KO.
On January 19, 2019 Kotetsu Boku faced off against Bruno Pucci in a featherweight bout at age 41. He was coming in with a record of 26-13-2 (14), and Pucci was 28 years old and with a record of 6-3 (6). Boku lost the fight via 1st-round submission.
On December 9, 2017 Kotetsu Boku faced off against Christian Lee in a featherweight bout at age 40. He was coming in with a record of 26-12-2 (14), and Lee was 19 years old and with a record of 7-1 (7). Boku lost the fight via 1st-round KO.
On May 6, 2016 Kotetsu Boku faced off against Jadamba Narantungalag in a featherweight bout at age 38. He was coming in with a record of 24-11-2 (12), and Narantungalag was 40 years old and with a record of 10-4 (5). Boku lost the fight via 3rd-round choke-out.
On May 2, 2014 Kotetsu Boku faced off against Eduard Folayang in a lightweight bout at age 36. He was coming in with a record of 21-10-2 (9), and Folayang was 30 years old and with a record of 13-4 (7). Boku lost the fight via 3-round unanimous decision.
On September 13, 2013 Kotetsu Boku faced off against Vuyisile Colossa in a lightweight bout at age 36. He was coming in with a record of 20-9-2 (8), and Colossa was 31 years old and with a record of 5-4 (5). Boku lost the fight via 3-round unanimous decision.
On April 5, 2013 Kotetsu Boku met Shinya Aoki in a lightweight (ONE FC Championship) title defense fight. Boku was 35 years old and with a record of 20-8-2 (8), and Aoki was 29 years old and with a record of 32-6 (20). Boku lost the fight via 2nd-round submission and lost the title.
On July 18, 2011 Kotetsu Boku fought Kuniyoshi Hironaka in a welterweight title fight for the Shooto Championship title. Boku was 34 years old and with a record of 18-7-2 (6), and Hironaka was 35 years old and with a record of 18-8 (12). Boku lost the fight via 3-round unanimous decision.
On September 22, 2009 Kotetsu Boku fought Yusuke Endo in a welterweight title fight for Endo's Shooto Championship title. Boku was 32 years old and with a record of 14-6-2 (5). Boku lost the fight via 1st-round submission.
On March 15, 2008 Kotetsu Boku faced off against Joachim Hansen in a welterweight bout at age 30. He was coming in with a record of 13-5-1 (4), and Hansen was 28 years old and with a record of 16-6-1 (10). Boku lost the fight via 2-round unanimous decision.
On December 1, 2007 Kotetsu Boku faced off against Artur Oumakhanov in a welterweight bout at age 30. He was coming in with a record of 13-4-1 (4). Boku lost the fight via 3-round split decision.
On June 27, 2003 Kotetsu Boku faced off against Kenichiro Togashi at age 26. He was coming in with a record of 4-3 (2). Boku lost the fight via 1st-round submission.
On February 6, 2003 Kotetsu Boku faced off against Mitsuhiro Ishida at age 25. He was coming in with a record of 4-2 (2), and Ishida was 24 years old and with a record of 3-1 (1). Boku lost the fight via 2-round unanimous decision.
On May 5, 2002 Kotetsu Boku faced off against Takaharu Murahama at age 24. He was coming in with a record of 3-1 (1), and Murahama was 29 years old and with a record of 5-6-5 (2). Boku lost the fight via 2nd-round submission.
