Masahiro Oishi has 21 losses against 21 opponents on his MMA record. For a list of Oishi's best fights, refer to "Best fights of Masahiro Oishi".
On February 23, 2020 Masahiro Oishi faced off against Shunichi Shimizu in a bantamweight bout at age 51. He was coming in with a record of 29-21-9 (22), and Shimizu was 35 years old and with a record of 30-23-9 (21). Oishi lost the fight via 2nd-round submission.
On November 24, 2019 Masahiro Oishi faced off against Tatsuya Karasawa in a bantamweight bout at age 50. He was coming in with a record of 29-20-9 (22). Oishi lost the fight via 2-round unanimous decision.
On October 21, 2017 Masahiro Oishi faced off against Cleber Luciano in a bantamweight bout at age 48. He was coming in with a record of 26-19-9 (20). Oishi lost the fight via 2nd-round submission.
On September 12, 2015 Masahiro Oishi faced off against Takeya Takemoto in a bantamweight bout at age 46. He was coming in with a record of 24-18-9 (18). Oishi lost the fight via 2-round unanimous decision.
On August 18, 2012 Masahiro Oishi faced off against Masakazu Imanari in a bantamweight bout at age 43. He was coming in with a record of 22-17-9 (16), and Imanari was 36 years old and with a record of 25-11-2 (17). Oishi lost the fight via 1st-round submission.
On January 28, 2012 Masahiro Oishi faced off against Yuta Numakura in a bantamweight bout at age 43. He was coming in with a record of 21-16-9 (15). Oishi lost the fight via 2-round unanimous decision.
On July 16, 2011 Masahiro Oishi faced off against Abdul Guyirbegov in a bantamweight bout at age 42. He was coming in with a record of 21-15-8 (15). Oishi lost the fight via 1st-round KO.
On May 29, 2010 Masahiro Oishi faced off against Michael Mortimer in a bantamweight bout at age 41. He was coming in with a record of 19-14-7 (13). Oishi lost the fight via 3rd-round TKO.
On October 25, 2009 Masahiro Oishi fought Manabu Inoue in a bantamweight title fight for Inoue's Pancrase Championship title. Oishi was 40 years old and with a record of 19-13-7 (13). Oishi lost the fight via 3-round unanimous decision.
On May 23, 2009 Masahiro Oishi faced off against Gustavo Falciroli in a bantamweight bout at age 40. He was coming in with a record of 19-12-7 (13), and Falciroli was 26 years old and with a record of 6-1-2 (4). Oishi lost the fight via 2nd-round TKO.
On December 6, 2008 Masahiro Oishi faced off against Takeya Mizugaki in a bantamweight bout at age 40. He was coming in with a record of 19-11-7 (13), and Mizugaki was 24 years old and with a record of 10-2-2 (4). Oishi lost the fight via 2nd-round TKO.
On September 10, 2006 Masahiro Oishi faced off against Sergej Grecicho in a featherweight bout at age 37. He was coming in with a record of 14-10-6 (9), and Grecicho was 20 years old and with a record of 1-1-1 (1). Oishi lost the fight via 1st-round KO.
On January 23, 2005 Masahiro Oishi faced off against Remigijus Morkevicius in a featherweight bout at age 36. He was coming in with a record of 11-9-4 (7), and Morkevicius was 22 years old and with a record of 11-3 (11). Oishi lost the fight via 1st-round KO.
On September 12, 2004 Masahiro Oishi faced off against Jeff Curran in a featherweight bout at age 35. He was coming in with a record of 9-8-4 (6), and Curran was 27 years old and with a record of 18-7-1 (14). Oishi lost the fight via 1st-round choke-out.
On November 23, 2003 Masahiro Oishi faced off against Hideo Tokoro in a featherweight bout at age 34. He was coming in with a record of 8-7-4 (5), and Tokoro was 26 years old and with a record of 8-7-1 (6). Oishi lost the fight via 1st-round submission.
On August 10, 2003 Masahiro Oishi met Ryota Matsune in a featherweight (Shooto World) title defense fight. Oishi was 34 years old and with a record of 8-6-4 (5), and Matsune was 21 years old and with a record of 11-1 (2). Oishi lost the fight via 3-round majority decision and lost the title.
On May 22, 2000 Masahiro Oishi faced off against Baret Yoshida at age 31. He was coming in with a record of 5-5-3 (2), and Yoshida was 25 years old and with a record of 1-1 (1). Oishi lost the fight via 2nd-round submission.
On March 28, 1999 Masahiro Oishi faced off against Alexandre Franca Nogueira at age 30. He was coming in with a record of 5-4-2 (2), and Nogueira was 21 years old and with a record of 1-0 (0). Oishi lost the fight via 1st-round submission.
On February 2, 1999 Masahiro Oishi faced off against Cheyanne Padeken at age 30. He was coming in with a record of 5-3-2 (2). Oishi lost the fight via 1st-round KO.
On August 27, 1997 Masahiro Oishi faced off against Hisao Ikeda at age 28. He was coming in with a record of 3-2-2 (1). Oishi lost the fight via 2-round unanimous decision.
On September 26, 1994 Masahiro Oishi faced off against Masato Suzuki at age 25. He was coming in with a record of 1-1 (0). Oishi lost the fight via 2nd-round submission.
