Mamoru Yamaguchi
Japanese martial artist
Mamoru Yamaguchi (born May 29, 1977) is a Japanese mixed martial artist who competes in Pancrase. He is the former Shooto Bantamweight (123 lb) Champion, former Shooto Featherweight (132 lb) Champion, former Pancrase Flyweight Champion, as well as a former King of the Cage Junior Flyweight Champion. Mamoru is known for his counter striking and his trilogy with the former Shooto Bantamweight Champion Shinichi Kojima.
He has been consistently ranked as one of the top flyweight in the world by Sherdog's Official Mixed Martial Arts Rankings. He is considered, by Fight Matrix, to be the third best flyweight in the history of mixed martial arts.
His afro is a tribute to Japanese boxing legend, Yoko Gushiken.
Martial arts career
Yamaguchi made his professional debut in 1999 during Shooto - Renaxis 2, against Shuichiro Katsumura.
After making his debut, Yamaguchi went on a five fight unbeaten streak. He earned a decision win over Jin Akimoto, a submission win over Ryan Diaz, a TKO win over Baret Yoshida, a draw against Masaru Gokita and a knee KO win over Yoshinobu Ota. These victories entitled win a fight for the inaugural Shooto Featherweight (132 lb) Championship, in a rematch against Jin Akimoto.
Begin with the source’s own compact description: “Mamoru Yamaguchi” is japanese martial artist. The dossier treats that line as a proposition to test through Mamoru, Yamaguchi and Japanese, not as a finished interpretation.
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The phrase “japanese martial artist” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
The entry’s evidential value lies in the named roles, institutions and publications that can be tested against primary documentation. The source revision retrieved here is dated Sep 1, 2026. The linked authority identifier is Q11466757. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1977 and 1999.
A concise life account rarely captures disputed attribution, private networks or the changing language used to describe a career. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Mamoru Yamaguchi” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.