Mamoru Yamaguchi (31-13-5, 15) was born in Yokohama, Kanagawa, Japan on May 29, 1977. At the age of 22 years on July 16, 1999, he made his professional MMA debut against Shuichiro Katsumura, winning the fight via 2-round unanimous decision.
Yamaguchi's last fight was a 3-round unanimous decision loss to Toru Ogawa at Pancrase: 305 at age 41 on May 26, 2019. He retired on a 3-fight losing streak.
Some of Mamoru Yamaguchi's best fights have been against Jin Akimoto, Yosuke Saruta, Yoshinobu Ota, Hiroaki Yoshioka, Luis Nogueira, Junji Ikoma and Daiji Takahashi.
Yamaguchi has 13 losses on his MMA record.
| # | Date | Opponent | Promotion | Weight | Round | Method | Result |
|---|---|---|---|---|---|---|---|
49 | May 26, 2019 41 years, 11 months 31-13-5 (15) | Toru Ogawa | Pancrase | FL | 3 | UD | LOSS |
48  | Jul 1, 2018 41 years, 1 months 31-12-5 (15) | 23 years, 4 months 9-2 (8) | Pancrase | FL | 2 | TKO | LOSS Punches |
47 | Aug 20, 2017 40 years, 2 months 31-11-5 (15) | Senzo Ikeda | Pancrase | FL | 5 | UD | LOSS Lost Pancrase flyweight title |
46 | Mar 12, 2017 39 years, 9 months 31-10-5 (15) | Ryuichi Miki | Pancrase | FL | 5 | SD | WIN Won Pancrase flyweight title |
45  | Oct 2, 2016 39 years, 4 months 30-10-5 (15) | 31 years, 5 months 21-4-1 (11) | Pancrase | LFL | 3 | SD | WIN |
44 | Apr 24, 2016 38 years, 10 months 29-10-5 (15) | Senzo Ikeda | Pancrase | LFL | 3 | SD | WIN |
43 | Dec 13, 2015 38 years, 6 months 28-10-5 (15) | Yuki Yasunaga | Pancrase | LFL | 3 | SD | LOSS |
42 | Aug 9, 2015 38 years, 2 months 28-9-5 (15) | Yusuke Kitago | Pancrase | LFL | 3 | SD | WIN |
41 | May 3, 2015 37 years, 11 months 27-9-5 (15) | Kosuke Suzuki | LFL | 3 | UD | DRAW Split | |
40  | Oct 4, 2014 37 years, 4 months 27-9-4 (15) | 27 years, 2 months 9-4-2 (3) | LFL | 2 | TKO | WIN Doctor stoppage | |
39 | Feb 23, 2014 36 years, 8 months 26-9-4 (14) | Czar Sklavos | LFL | 1 | SUB | LOSS Rear-naked choke | |
38  | Oct 20, 2013 36 years, 4 months 26-8-4 (14) | 31 years, 11 months 30-13-2 (19) | DEEP | LFL | 3 | UD | DRAW Majority |
37  | Jun 22, 2013 36 years 26-8-3 (14) | 26 years 8-2 (3) | LFL | 3 | MD | LOSS | |
36  | Dec 24, 2012 35 years, 6 months 26-7-3 (14) | 25 years, 1 months 11-2 (9) | LFL | 3 | SD | LOSS | |
35 | Aug 6, 2011 34 years, 2 months 26-6-3 (14) | Jussier da Silva | LFL | 3 | UD | LOSS | |
34 | May 5, 2011 33 years, 11 months 26-5-3 (14) | Kevin Dunsmoor | LFL | 2 | KO | WIN Punch | |
33 | Nov 19, 2010 33 years, 5 months 25-5-3 (13) | Fumihiro Kitahara | LFL | 1 | KO | WIN Head kick | |
32 | Aug 5, 2010 33 years, 2 months 24-5-3 (12) | Greg Guzman | KOTC | LFL | 2 | TKO | WIN Elbows |
31 | Jan 30, 2010 32 years, 8 months 23-5-3 (11) | Frank Baca | KOTC | LFL | 2 | SUB | WIN Rear-naked choke Won KOTC light-flyweight title |
30 | Nov 23, 2009 32 years, 5 months 22-5-3 (10) | Kiyotaka Shimizu | BT | 3 | MD | WIN | |
29 | Oct 30, 2009 32 years, 5 months 21-5-3 (10) | Jesse Taitano | BT | 1 | TKO | WIN Punches | |
28  | Jul 18, 2008 31 years, 1 months 20-5-3 (9) | 29 years, 5 months 8-3-4 (4) | BT | 3 | SUB | LOSS Guillotine choke For Shooto | |
27 | Mar 28, 2008 30 years, 9 months 20-4-3 (9) | Masaaki Sugawara | BT | 3 | UD | WIN | |
26 | Feb 23, 2008 30 years, 8 months 19-4-3 (9) | Yuki Shoujou | BT | 3 | UD | WIN | |
25 | Sep 22, 2007 30 years, 3 months 18-4-3 (9) | Yasuhiro Urushitani | BT | 3 | UD | LOSS | |
24 | Jun 2, 2007 30 years 18-3-3 (9) | Yusei Shimokawa | BT | 3 | UD | WIN | |
23 | Oct 14, 2006 29 years, 4 months 17-3-3 (9) | 27 years, 8 months 6-1-3 (3) | BT | 1 | CKO | LOSS Rear naked choke Lost Shooto | |
22 | Sep 8, 2006 29 years, 3 months 17-2-3 (9) | Erikas Suslovas | BT | 1 | TKO | WIN Punches | |
21 | May 12, 2006 28 years, 11 months 16-2-3 (8) | Setsu Iguchi | BT | 1 | TKO | WIN Cut | |
20 | Mar 24, 2006 28 years, 9 months 15-2-3 (7) | 27 years, 1 months 5-1-2 (2) | BT | 3 | UD | DRAW Defended Shooto | |
19  | Dec 17, 2005 28 years, 6 months 15-2-2 (7) | 28 years, 9 months 6-7-2 (1) | BT | 3 | UD | WIN | |
18 | Sep 23, 2005 28 years, 3 months 14-2-2 (7) | Pat Seidel | BT | 2 | SUB | WIN Rear naked choke | |
17 | May 4, 2005 27 years, 11 months 13-2-2 (6) | Stonnie Dennis | BT | 1 | KO | WIN Kick | |
16  | Jan 29, 2005 27 years, 8 months 12-2-2 (5) | 34 years, 9 months 7-5-1 (4) | BT | 3 | UD | WIN | |
15  | Sep 26, 2004 27 years, 3 months 11-2-2 (5) | 26 years, 6 months 2-1 (0) | BT | 3 | UD | DRAW Defended Shooto | |
14  | May 3, 2004 26 years, 11 months 11-2-1 (5) | 30 years, 4 months 5-6-2 (2) | BT | 3 | KO | WIN Knee to the body | |
13 | Dec 14, 2003 26 years, 6 months 10-2-1 (4) | Yasuhiro Urushitani | BT | 3 | UD | WIN Won Shooto | |
12 | Mar 18, 2003 25 years, 9 months 9-2-1 (4) | Homare Kuboyama | FL | 3 | UD | WIN | |
11 | Sep 16, 2002 25 years, 3 months 8-2-1 (4) | 24 years, 5 months | FL | 3 | UD | LOSS | |
10 | Apr 14, 2002 24 years, 10 months 8-1-1 (4) | 28 years, 3 months 4-3-2 (2) | FL | 3 | UD | WIN | |
9  | Nov 25, 2001 24 years, 5 months 7-1-1 (4) | 32 years, 11 months 7-5-3 (4) | FT | 1 | SUB | LOSS Triangle/armbar Lost Shooto | |
8 | Mar 2, 2001 23 years, 9 months 7-0-1 (4) | Gildo Lima | FT | 1 | SUB | WIN Armbar | |
7  | Dec 17, 2000 23 years, 6 months 6-0-1 (3) | 29 years, 8 months 7-4-2 (3) | FT | 3 | UD | WIN Won Shooto | |
6  | Aug 27, 2000 23 years, 2 months 5-0-1 (3) | 27 years, 9 months 3-1 (0) | 3 | KO | WIN Knee | ||
5  | Mar 17, 2000 22 years, 9 months 4-0-1 (2) | 29 years, 6 months 1-3 (0) | 2 | UD | DRAW | ||
4  | Dec 7, 1999 22 years, 6 months 4-0 (2) | 24 years, 7 months 1-0 (1) | 3 | TKO | WIN Punches | ||
3 | Nov 4, 1999 22 years, 5 months 3-0 (1) | Ryan Diaz | 2 | SUB | WIN Armbar | ||
2 | Sep 5, 1999 22 years, 3 months 2-0 (0) | 28 years, 4 months 5-3-2 (2) | 2 | MD | WIN | ||
1  | Jul 16, 1999 22 years, 1 months 1-0 (0) | 23 years 1-0 (0) | 2 | UD | WIN |
