Koetsu Okazaki has four losses against four opponents on his MMA record. For a list of Okazaki's best fights, refer to "Best fights of Koetsu Okazaki".
On December 5, 2014 Koetsu Okazaki faced off against Kevin Belingon in a bantamweight bout at age 35. He was coming in with a record of 10-4-1 (4), and Belingon was 27 years old and with a record of 12-4 (8). Okazaki lost the fight via 3-round unanimous decision.
On May 31, 2013 Koetsu Okazaki fought Bibiano Fernandes in a bantamweight title fight for Fernandes' ONE FC Championship title. Okazaki was 33 years old and with a record of 8-3-1 (2), and Fernandes was 33 years old and with a record of 13-3 (4). Okazaki lost the fight via 5-round unanimous decision.
On May 18, 2012 Koetsu Okazaki faced off against Hiromasa Ougikubo at age 32. He was coming in with a record of 8-2-1 (2), and Ougikubo was 25 years old and with a record of 9-2-2 (3). Okazaki lost the fight via 3rd-round submission.
On March 28, 2008 Koetsu Okazaki faced off against Masakatsu Ueda at age 28. He was coming in with a record of 5-1-1 (0), and Ueda was 30 years old and with a record of 7-0-1 (3). Okazaki lost the fight via 3-round unanimous decision.
