Mamoru Yamaguchi
31–13 · 48 recorded bouts · 1999–2019
31–13
Mamoru Yamaguchi finished 48% of 31 wins inside the distance — the 25th percentile for flyweight MMA, where the median is 58%. No reach is on record, so this page compares record rather than measurements.
SOURCE·Mamoru Yamaguchi — English Wikipedia (CC BY-SA 4.0)·derived figures computed here·REVIEWED 2026-07-19
How this record is compiled
- Measurements come from the fighter's English Wikipedia infobox; the bout list is parsed from the results table on the same article, read on 2026-07-19. Boxing tables are read by header name and MMA records by the fixed column order of the
MMA recordtemplate — two different parsers, because reading MMA rows as a boxing table returns a fighter's boxing record in place of their real one. - A bout enters the ledger with whatever fields the source states: result, opponent, method, round, year. Any field the source leaves empty stays empty here. A date that cannot be established is left blank rather than inferred, and the bout is still counted.
- A no contest is counted and printed as a no contest. It is never folded into the wins, the losses or the draws, and it never disappears to make a total balance.
- Where the article's infobox total disagrees with its own results table, both figures are published and each is labelled with where it came from. Nothing is averaged and nothing is reconciled against a second database.
- Percentiles rank this fighter among the 150 flyweight MMA fighters in the dataset — the most specific group of at least 30 that this fighter belongs to.
Bout record
Every bout the article's own results table lists, in order. A dash is a field the source leaves empty — it is not a zero and it is not a guess.
| Year | Result | Opponent | Method | Rd |
|---|---|---|---|---|
| 2019 | L | Toru Ogawa | Decision | 3 |
| 2018 | L | Yuya Wakamatsu | KO/TKO | 2 |
| 2017 | L | Senzo Ikeda | Decision | 5 |
| 2017 | W | Ryuichi Miki | Decision | 5 |
| 2016 | W | Luis Nogueira | Decision | 3 |
| 2016 | W | Senzo Ikeda | Decision | 3 |
| 2015 | L | Yuki Yasunaga | Decision | 3 |
| 2015 | W | Yusuke Kitago | Decision | 3 |
| 2015 | D | Kosuke Suzuki | Draw | 3 |
| 2014 | W | Yosuke Saruta | KO/TKO | 2 |
| 2014 | L | Czar Sklavos | Submission | 1 |
| 2013 | D | Yoshiro Maeda | Draw | 3 |
| 2013 | L | Mikihito Yamagami | Decision | 3 |
| 2012 | L | Darrell Montague | Decision | 3 |
| 2011 | L | Jussier da Silva | Decision | 3 |
| 2011 | W | Kevin Dunsmoor | KO/TKO | 2 |
| 2010 | W | Fumihiro Kitahara | KO/TKO | 1 |
| 2010 | W | Greg Guzman | KO/TKO | 2 |
| 2010 | W | Frank Baca | Submission | 2 |
| 2009 | W | Kiyotaka Shimizu | Decision | 3 |
| 2009 | W | Jesse Taitano | KO/TKO | 1 |
| 2008 | L | Shinichi Kojima | Submission | 3 |
| 2008 | W | Masaaki Sugawara | Decision | 3 |
| 2008 | W | Yuki Shoujou | Decision | 3 |
| 2007 | L | Yasuhiro Urushitani | Decision | 3 |
| 2007 | W | Yusei Shimokawa | Decision | 3 |
| 2006 | L | Shinichi Kojima | Submission | 1 |
| 2006 | W | Erikas Suslovas | KO/TKO | 1 |
| 2006 | W | Setsu Iguchi | KO/TKO | 1 |
| 2005 | W | Daiji Takahashi | Decision | 3 |
| 2005 | W | Pat Seidel | Submission | 2 |
| 2005 | W | Stonnie Dennis | KO/TKO | 1 |
| 2005 | W | Junji Ikoma | Decision | 3 |
| 2004 | D | Robson Moura | Draw | 3 |
| 2004 | W | Hiroaki Yoshioka | KO/TKO | 3 |
| 2003 | W | Yasuhiro Urushitani | Decision | 3 |
| 2003 | W | Homare Kuboyama | Decision | 3 |
| 2002 | L | Robson Moura | Decision | 3 |
| 2002 | W | Hiroaki Yoshioka | Decision | 3 |
| 2001 | L | Masahiro Oishi | Submission | 1 |
| 2001 | W | Gildo Lima | Submission | 1 |
| 2000 | W | Jin Akimoto | Decision | 3 |
| 2000 | W | Yoshinobu Ota | KO/TKO | 3 |
| 2000 | D | Masaru Gokita | Draw | 2 |
| 1999 | W | Baret Yoshida | KO/TKO | 3 |
| 1999 | W | Ryan Diaz | Submission | 2 |
| 1999 | W | Jin Akimoto | Decision | 2 |
| 1999 | W | Shuichiro Katsumura | Decision | 2 |
7 of these opponents have their own page here.
SOURCE·Mamoru Yamaguchi — English Wikipedia (CC BY-SA 4.0)·derived figures computed here·REVIEWED 2026-07-19
What is on record
| Reach | not recorded | |
|---|---|---|
| Height | 64″ (162.6 cm) | |
| Stance | — | |
| Division | Flyweight MMA competed at 2: bantamweight, flyweight — compared here against the last | |
| Most active decade | 2000s — 25 of 48 dated bouts | |
| Country | Japan |
Wikipedia carries no reach figure for Mamoru Yamaguchi, so the reach-advantage comparison this site is built on cannot be computed. Everything below comes from the record instead.
Record
MMA record
31–13
49 bouts on record
Finish rate
48%
of wins ended inside the distance — flyweight MMA median 58%, 25th percentile
The career, bout by bout
48 recorded bouts from 1999 to 2019. Every incumbent shows this as a table you have to read; here it is as a shape you can see.
Career span
21y
1999–2019
Longest unbeaten run
8
without a loss — draws do not break it
Busiest year
1999
4 bouts
Recorded bouts
48
48 with a date
Records in more than one sport
Every incumbent database is siloed by sport. Mamoru Yamaguchi competed in 2, so the records sit together here.
| Discipline | Won | Lost | By KO |
|---|---|---|---|
| MMA | 31 | 13 | 11 |
| Kickboxing | 4 | 1 | — |
What this record does and does not say
- What is Mamoru Yamaguchi's record?
- 31–13 in MMA. That is the aggregate stated in the English Wikipedia infobox; the results table on the same article lists 48 bouts individually.
- Does a no contest change a record here?
- No. A no contest is not a win, a loss or a draw, and it is never folded into one. It is counted and printed separately, so a 20–0 record with two no contests is shown as exactly that rather than as 22–0 or as 20–0 with the no contests dropped. The same applies to a bout overturned after the fact where the source records the change.
- What happens when sources disagree about a fight?
- This site publishes one source — the fighter's English Wikipedia article, read on the date printed under every table — and it does not silently reconcile that against anyone else's database. Where the article's own infobox total and its own results table disagree, both are shown and the page says which one each figure came from. Nothing is averaged, and no field is filled in from a second source to make a total balance.
Where this record leads
The 151 flyweight MMA fighters this record is ranked against, and the distribution Yamaguchi sits inside.
151 FIGHTERS 2000s MMA25 of these bouts fall in the 2000s. This is what the rest of that decade's records look like.
541 FIGHTERS Longest unbeaten runsMamoru Yamaguchi went 8 without a loss. This is where that sits against every run on the site.
LEADERBOARD