Boxing in Japan
The history of boxing in Japan began in 1854 when Matthew Perry landed at Shimoda, Shizuoka soon after the Convention of Kanagawa. At that time, American sailors often engaged in sparring matches on board their ships, with their fists wrapped in thin leather. It was the first example of boxing conveyed to Japan. In addition, an ōzeki-ranked sumo wrestler named Tsunekichi Koyanagi (小柳 常吉) was summoned by the Shogunate, and ordered to fight a boxer and a wrestler from the United States. The three fought matches, using different martial arts' styles, before Perry and other spectators. Koyanagi reportedly won.
- 1 History
- 2 Amateur boxing
- 3 Professional boxing
- 4 Boxing fatalities
- 5 See also
- 6 Notes
- 7 References
- 8 Bibliography
- 9 External links
The first exhibition match named Western Professional Sumo (西洋大相撲) was held in Tsukiji, Tokyo in 1887. The first boxing gym Meriken Training Institute (メリケン練習所) was established in Ishikawachō, Yokohama, Kanagawa by James Hōjō (ジェームス 北條) and Toranosuke Saitō (齋藤 虎之助) in 1896. After the first tutorial book Bōgeki Jizai Seiyō Kentōjutsu (防撃自在西洋拳闘術) was issued in 1900, followed shortly by International Jūken Club (国際柔拳倶楽部) was opened in Mikage, Kobe by Kenji Kanō (嘉納 健治) in 1909.
After learning boxing in San Francisco, California since 1906, Yūjirō Watanabe (渡辺 勇次郎, aka Father of Japanese Boxing or Four-Round King) established Nippon Kentō Club (日本拳闘倶楽部) in Shimomeguro, Meguro, Tokyo, on December 25, 1921. Sadayuki Ogino (荻野 貞行, aka Mother of Japanese Boxing) from Rikkyo University began boxing under Watanabe's management. Ogino in the junior featherweight and Kinzaburō Yokoyama (横山 金三郎) in the featherweight were recognized as the first Japanese champions by Nippon Kentō Club in 1922.
In the first Japanese title matches for professional boxers held in April 1924, Fuji Okamoto in the flyweight division and Kintarō Usuda in the lightweight division became titleholders. There was no clear distinction between amateur and professional around that time.
Inauguration of Federation
Simultaneously with National Student Kentō Federation (全国学生拳闘連盟) whose president was Yūjirō Watanabe, the All-Japan Amateur Federation (全日本アマチュア連盟) was established in July 1926. The first Japanese championships for amateur boxers was held by Dai Nippon Kentōkai (大日本拳闘会) in 1927. Fuji Okamoto in the bantamweight division and Kintarō Usuda in the welterweight division participated in the 1928 Summer Olympics.
All-Japan Professional Kentō Association (全日本プロフェッショナル拳闘協会) founded in February 1931 in order to perform the establishment of championships and the development of professional boxers, repeated division and dissolution to become the current Japan Pro Boxing Association (JPBA). Tsuneo Horiguchi (堀口 恒男, aka Piston Horiguchi, Saint Fist; 拳聖) from Waseda University gained popularity and played an active part in those days. Although Japan's boxing was interrupted by the Pacific War, the first Japanese championships after the war was held in 1947.
World title match
Then the Japan Boxing Commission (JBC), virtually the only governing body of Japan's professional boxing, was founded in order to prepare Yoshio Shirai's world title match. Its establishment was presented at the Tokyo Kaikan on April 21, 1952. Munehide Tanabe (田邊 宗英, often written as 田辺 宗英) from Waseda University who was the founding president of Teiken Boxing Gym and the president of the Korakuen Stadium, was elected as its first commissioner.
Shirai defeated lineal champion Dado Marino via a unanimous decision in the flyweight division on May 19 of that year, while being watched by 45,000 spectators at the Korakuen Stadium, to become the Japan's first world champion.
WBA and WBC
In June 1956, Boxing Magazine, the Japan's oldest surviving boxing journal, was launched by the Baseball Magazine Company. Currently there is only one other monthly boxing journal in Japan, called Boxing Beat. This has been renamed twice from World Boxing since 1968.
Pro-Am joint training
From 2011 through 2012, the middleweight boxers had record-breaking performances both in amateur and professional boxing. Nobuhiro Ishida knocked out the previously undefeated James Kirkland at the MGM Grand Las Vegas to be awarded The Ring Upset of the Year. Ryōta Murata secured the silver medal in the World Amateur Boxing Championships in Baku, Azerbaijan to qualify for the 2012 Summer Olympics. Tadashi Yuba won his fifth Japanese title in four different weight divisions to be a quadruple champion. All those are the first records for Japan. In August 2013, Yuba picked up the Japanese super welterweight title to be a quintuple champion.
Most of the world championship fights have been televised mainly on Nittere (NTV), TBS, Fuji TV and TV Tokyo. Currently, these programs can be legally watched outside Japan via KeyHoleTV. In addition, pay-TV channels such as WOWOW and sky-A sports+ have provided boxing programs. Although Fuji TV had been withdrawn from boxing except for the late-night show since Yūji Watanabe lost to Genaro Hernández in 1992, they resumed a live boxing program in prime time from April 2013.
The Summer Olympics medalists are:
|Kiyoshi Tanabe||1960 Rome||Bronze||Flyweight|
|Takao Sakurai||1964 Tokyo||Gold||Bantamweight|
|Eiji Morioka||1968 Mexico||Bronze||Bantamweight|
|Satoshi Shimizu||2012 London||Bronze||Bantamweight|
|Ryōta Murata||2012 London||Gold||Middleweight|
The World Championships medalists are:
|Kōki Ishii||1978 Belgrade||Bronze||Flyweight|
|Masatsugu Kawachi||2007 Chicago||Bronze||Light welterweight|
|Ryōta Murata||2011 Baku||Silver||Middleweight|
In Japan, every professional boxer must contract with a manager under the JBC rules, and is required to belong to a boxing gym which has exclusive management rights for boxers as a member of each regional subsidiary body of Japan Pro Boxing Association under the Japan's conventional gym system. Two professional boxers belonging to the same gym have not been allowed to fight against each other unless one of them transfers to other gym, because it might disrupt the gym system. However, it is often quite difficult for boxers to transfer between the gyms due to the matters on transfer fees, match fees and so on.
The JBC set up the Japanese heavyweight title once in 1957, but that division did not last long because there were few heavyweight boxers in Japan at that time. Therefore, they have recognized the titles and ratings only in thirteen weight divisions from minimumweight to middleweight for over fifty years. They added four weight divisions i.e. super middleweight, light heavyweight, cruiserweight and heavyweight, from September 2009. Kyōtarō Fujimoto was crowned the heavyweight champion in July 2013.
Currently Japan has two major annual tournaments. One is the All-Japan Rookie King (全日本新人王 Zen-Nihon shinjin'ō) Tournament which came to be known by the popular anime/manga series Hajime no Ippo,[* 2] and the other is the Japanese Title Elimination Tournament nicknamed The Strongest in Korakuen (最強後楽園 Saikyō Kōrakuen, former Class A Tournament) which is competed by "class A boxers" who have acquired a "class A license" to fight in eight or more round bouts, and whose winners would be recognized as the next mandatory challengers against each divisional Japanese champion in the annual mandatory bout series Champion Carnival. In addition to those, there are several other tournaments such as Raging Battle (renamed from B:Tight!).
As of November 2013, Japan produced 85 male world champions and 18 female world champions. When Yōta Satō won the world title to be the twelfth world champion managed by Kyoei Boxing Gym in March 2012, Japan had had nine world champions at the same time including an "emeritus champion" and a "champion in recess". Although nine boxers except non-Japanese nationals and females were crowned world champions across the sea, it is in contrast to the status of boxing in the Philippines where 31 of 40 world champions won the title abroad as of April 2016. Katsunari Takayama fighting out of the ALA Boxing Gym of Cebu City has won the IBF title in 2013, after resigning his JBC license in 2009 in order to fight for the IBF or the WBO title outside Japan.
|1968||Shōzo Saijō||Featherweight||Los Angeles, California, United States||Won by UD|
|1970||Kuniaki Shibata||Featherweight||Tijuana, Baja California, Mexico||Won by RTD|
|1973||Kuniaki Shibata (Second tenure)||Junior lightweight||Honolulu, Hawaii, United States||Won by UD|
|1980||Shōji Oguma (Second tenure)||Flyweight||Seoul, South Korea||Won by KO|
|1980||Yasutsune Uehara||Junior lightweight||Detroit, Michigan, United States||Won by KO|
|1981||Tadashi Mihara||Junior middleweight||Rochester, New York, United States||Won by MD|
|1992||Akinobu Hiranaka||Junior welterweight||Mexico City, Federal District, Mexico||Won by TKO|
|2013||Katsunari Takayama (Third tenure)||Mini flyweight||Guasave, Sinaloa, Mexico||Won by UD|
|2013||Kōki Etō (Interim)||Flyweight||Bangkok, Thailand||Won by UD|
|2013||Tomoki Kameda||Bantamweight||Cebu City, Philippines||Won by UD|
Japan's male world champions rarely risk their titles outside of their country. Apart from non-Japanese nationals, the thirteen champions did it, and the only four among them successfully defended their titles. That is because Japan's professional boxing has given priority to holding the fights in their own country to get paid television broadcast rights fees. Consequently, Japan's champions still remain internationally unrecognized. The broadcast rights fees have decreased under the economic downturn.
|1963||Fighting Harada||Flyweight||Bangkok, Thailand||Lost by MD|
|1964||Hiroyuki Ebihara||Flyweight||Bangkok, Thailand||Lost by SD|
|1973||Kuniaki Shibata||Junior lightweight||Honolulu, Hawaii, United States||Lost by KO|
|1976||Guts Ishimatsu||Lightweight||Bayamón, Puerto Rico||Lost by UD|
|1976||Royal Kobayashi||Junior featherweight||Seoul, South Korea||Lost by MD|
|1985||Jirō Watanabe||Junior bantamweight||Daegu, South Korea||Retained by TKO|
|2009||Toshiaki Nishioka||Super bantamweight||Monterrey, Nuevo León, Mexico||Retained by TKO|
|2010||Nobuhiro Ishida (Interim)||Super welterweight||Tepic, Nayarit, Mexico||Lost by SD|
|2011||Akifumi Shimoda||Super bantamweight||Atlantic City, New Jersey, United States||Lost by KO|
|2011||Toshiaki Nishioka (Second time)||Super bantamweight||Las Vegas, Nevada, United States||Retained by UD|
|2013||Yōta Satō||Super flyweight||Sisaket, Thailand||Lost by TKO|
|2013||Takashi Miura||Super featherweight||Cancun, Mexico||Retained by UD|
|2013||Kōki Kameda||Bantamweight||Jeju Province, South Korea||Retained by SD|
|2013||Kōki Etō (Interim)||Flyweight||Chonburi, Thailand||Lost by TKO|
Japanese boxers have very low recognition in the United States as cable networks are generally unconcerned with the lower weight classes to which most of the Japanese boxers belong. In April 2012, The Ring's Doug Fischer outlined the following three basic conditions that are required for Japan's boxing in order to earn international recognition:
- The Japanese commission needs to recognize the WBO and the IBF.
- Japan's top promoters need to bring in more world-class fighters from outside of Asia to challenge their fighters.
- The Japanese titleholders need to fight each other.— Doug Fischer, Dougie's Friday mailbag, RingTV.com
The fight between the WBC's Kazuto Ioka and the WBA's Akira Yaegashi in June 2012 was the first-ever world title unification match for Japan's world champions. The president of Japan Pro Boxing Association Hideyuki Ohashi mentioned that it could be a healthy sign for the future of Japan's boxing. Prior to that, there have been two attempts to unify the world titles. However, in the fight between the WBA's Jirō Watanabe and the WBC's Payao Poontarat, Watanabe was stripped of his WBA title before the fight since he participated in that bout under the WBC rules without being sanctioned by the WBA. The chairman of the WBA's championship committee Elias Cordova had warned on the day of the fight stating that "The minute he steps into the ring Watanabe will be stripped of his title." In the fight between the WBC's Hozumi Hasegawa and the WBO's Fernando Montiel, Montiel's WBO title was not at stake because the JBC had recognized only the WBA, WBC and its co-founder OPBF as legitimate governing organizations sanctioning championship bouts and had not allowed their boxers to fight for the other organizations' titles.
WBO and IBF
On February 28, 2011, the JBC permitted them only when a Japan's reigning world titleholder of the WBA and/or WBC was going to fight in a title unification match against a world champion of the WBO and/or IBF. However, at that time, even if a Japan's champion won, he had to vacate the newer WBO and/or IBF title after a fixed period, and a defense match for the newer title was not authorized.
The JBC announced that they would join the WBO and the IBF on April 1, 2013. Although they still do not recognize the international title and regional titles, the JBC decided to allow their boxers to fight for any world titles of the four major sanctioning bodies.
From 1950 through 2011, Tokyo was the city with the most boxing fatalities in the world. After the JBC's inception in April 1952, thirty-eight Japanese professional boxers died from the injury sustained in the fight. In 1973, one boxer among them died after an eighth-round knockout loss in a super featherweight ten-round bout in Agana, Guam. He is the only Japanese who died outside of his home country.
There were six fatal accidents before that. First, an African American died of athlete's heart after an exhibition match in Yokohama in 1902. The first Japanese fatality was the former national lightweight champion, Nobuo Kobayashi. He never regained consciousness after a ninth-round technical knockout loss at the Koshien tennis court in Nishinomiya, Hyōgo in 1930.
After the year 1952, five Japanese amateur boxers and two Thai professional boxers died due to a fight in Japan. In addition, one Japanese amateur boxer died of cerebral hemorrhage after the test for a professional boxer's license, and one Japanese professional boxer suffered a fatal cerebral hemorrhage during a sparring session. The thirty-eighth victim under the JBC's professional regulations and rules, and the fifty-third in total, died of subdural hematoma seventeen days after his first professional bout against another debutant.
- The WBC championships in Japan have always been sanctioned under the WBC's open scoring system since the world title doubleheader featuring Hozumi Hasegawa and Eagle Kyowa in November 13, 2006.
- In the All-Japan Rookie King Tournament, a boxer who unified rookie king titles of the West Japan (西日本 Nishinihon), Central Japan (中日本 Nakanihon) and Western part of Japan (西部日本 Seibu-Nihon) is promoted to the West representative (西軍代表 Seigun daihyō) and confronts the East Japan rookie king who is also the East representative (東軍代表 Tōgun daihyō) at the same time in order to decide the winner of the tournament. The West Japan rookie king can not fight against the East Japan rookie king unless he unifies all those three titles. To be exact, what is depicted as the West Japan rookie king in Hajime no Ippo ought to be the West representative.
- ボクシングの伝来と協会の歴史 – 第二章 ペリー提督によって日本に伝来 (in Japanese). Japan Pro Boxing Association. 2008. Retrieved March 16, 2011.
- Shun Kasahara, The University of Tokyo (Spring 2009). "Perry Visits Japan: a visual history – The Sumo Won Perry's Heart". Brown University Library. Archived from the original on July 19, 2011. Retrieved March 16, 2011.
- ボクシングの伝来と協会の歴史 – 第三章 ボクシングの父・渡辺勇次郎 (in Japanese). Japan Pro Boxing Association. 2008. Retrieved March 16, 2011.
- Baseball Magazine Sha 2004, p. 66.
- Baseball Magazine Sha 2002, p. 40.
- ボクシングの歴史 – 第4章 (in Japanese). Japan Boxing Commission. Retrieved March 16, 2011.
- Hisao Adachi (February 21, 2009). "¡Matsuda empató con Umetsu en el Korakuen!" (in Spanish). NotiFight.com. Retrieved March 16, 2011.
- Baseball Magazine Sha 2004, p. 242.
- Baseball Magazine Sha 2004, p. 172.
- Baseball Magazine Sha 2004, p. 67.
- ボクシングの伝来と協会の歴史 – 第四章 ジム創設ラッシュと拳闘協会発足 (in Japanese). Japan Pro Boxing Association. 2008. Retrieved March 16, 2011.
- ボクシングの伝来と協会の歴史 – 第五章 分裂、コミッション設立、解散、再編 (in Japanese). Japan Pro Boxing Association. 2008. Retrieved March 16, 2011.
- 復校祈り英国遠征 早大ボクシング部慈善試合 (in Japanese). Sankei Sports. October 30, 2011. Archived from the original on November 2, 2011. Retrieved October 30, 2011.
- Baseball Magazine Sha 2002, pp. 40–41.
- Baseball Magazine Sha 2002, p. 286.
- Baseball Magazine Sha 2002, p. 291.
- "Yoshio Shirai - Lineal Flyweight Champion". The Cyber Boxing Zone Encyclopedia.
- Baseball Magazine Sha 2002, p. 78.
- Seiichi Ashizawa (July 8, 2005). 酔いどれ芦沢記者の「想い出の名勝負」ジョニー・ファメション－ファイティング原田 (in Japanese). boxing.jp. Archived from the original on February 2, 2013. Retrieved April 17, 2012.
- (WBC Statement) (February 24, 2012). "WBC makes pitch for open scoring". Fightnews.com. Retrieved April 17, 2012.
- Dan Rafael (December 7, 2006). "Merits of open scoring a split decision of sorts". ESPN. Retrieved April 17, 2012.
- Chuck Johnson (November 16, 2006). "With new rule, boxers will know the score". USA Today. Retrieved April 17, 2012.
- 専門誌ボクシング・ワールド6月号で休刊 (in Japanese). Nikkan Sports. May 16, 2009. Retrieved April 17, 2012.
- Boxing Beat editorial department (May 30, 2011). 元プロ経験者のアマ資格認める 日連が画期的決定 (in Japanese). MACC Publications Inc. Retrieved April 17, 2012.
- Boxing Beat editorial department (August 30, 2010). プロ－アマ雪解け? 首脳同士が歴史的握手 (in Japanese). MACC Publications Inc. Retrieved April 17, 2012.
- Jake Donovan 2012, p. 44.
- Fitness Sports 2011, p. 109.
- Fitness Sports 2012, p. 29.
- Joe Koizumi (August 13, 2013). "Yuba acquires fifth Japanese national belt". Fightnews.com. Retrieved August 27, 2013.
- ワールドプレミアムボクシング (in Japanese). Nippon TV. Retrieved February 9, 2013.
- "TBS「BOXING」" (in Japanese). TBS. Retrieved February 9, 2013.
- ダイヤモンドグローブ (in Japanese). Fuji TV. Retrieved February 9, 2013.
- テレビ東京ボクシングオフィシャルサイト (in Japanese). TV Tokyo. Retrieved February 9, 2013.
- ボクシング「エキサイトマッチ」 (in Japanese). WOWOW. Retrieved February 9, 2013.
- "スカイ・A sports+ 格闘技" (in Japanese). sky-A sports+. Retrieved February 9, 2013.
- Takashi Itō (February 9, 2013). 井上、フジテレビ21年ぶりゴールデン生中継 (in Japanese). Sankei Sports. pp. 1–3. Archived from the original on February 12, 2013. Retrieved February 9, 2013.
- "JBC rules – Part 1" (in Japanese). West Japan Boxing Association. Archived from the original on November 4, 2010. Retrieved March 31, 2011.
- "Q and A – Question 1" (in Japanese). Japan Boxing Commission. Retrieved March 31, 2011.
- "坂田 vs 興毅の元同門対決今夏にも実現へ". Nikkan Sports. May 14, 2008.
- Asazawa & Shibuya 2007, p. 61
- Boxing Beat editorial department (September 24, 2009). "日本にS・ミドル級超ランキング設置" (in Japanese). MACC Publications Inc. Retrieved March 21, 2011.
- Joe Koizumi (July 26, 2013). "Fujimoto acquires first Japanese heavy belt in 56 years". Fightnews.com. Retrieved November 30, 2013.
- Boxing Beat editorial department (September 27, 2009). 西部－西日本新人王対抗戦結果 (in Japanese). MACC Publications Inc. Retrieved March 30, 2012.
- 『「最強後楽園」日本タイトル挑戦権獲得トーナメント』開催 (in Japanese). Japan Boxing Commission. June 3, 2008. Retrieved March 16, 2011.
- Boxing Beat editorial department (June 29, 2009). 高額賞金戦 "レイジングバトル" 8月開催 (in Japanese). MACC Publications Inc. Retrieved April 18, 2012.
- "World champion archives" (in Japanese). Japan Pro Boxing Association. 2012. Retrieved March 9, 2013.
- Joe Koizumi (March 28, 2012). "Sato-Suriyan: Full Report". Fightnews.com. Retrieved March 28, 2012.
- Isao Hara (June 2, 2010). 日本人の海外挑戦30連敗 (in Japanese). Nikkan Sports. Retrieved November 9, 2011.
- "Category:Filipino World Champions - BoxRec". boxrec.com. Retrieved 2016-03-31.
- Shigeru Masuda 2007, p. 55.
- Edri K. Aznar (April 2, 2013). "Takayama gives ALA third world title". Sun.Star Cebu. Retrieved May 25, 2013.
- 引退届の高山が海外での世界挑戦を希望 (in Japanese). Nikkan Sports. June 2, 2010. Retrieved November 18, 2009.
- Daisuke Yamaguchi (September 30, 2011). ボクシング・西岡、本場ラスベガスで王者のファイト (in Japanese). Nihon Keizai Shimbun. p. 2. Retrieved October 6, 2011.
- Makoto Maeda (June 16, 2009). 西岡の海外防衛戦が示すボクシング界の台所事情。〜海を渡る日本人王者の時代〜 (in Japanese). Number (Bungeishunjū). Retrieved October 6, 2011.
- Doug Fischer (April 6, 2012). "Dougie's Friday mailbag". RingTV.com. Retrieved April 11, 2012.
- Kazufumi Nomura (April 9, 2012). ミニマム級日本人2王者が会見 (in Japanese). Mainichi Shimbun. Archived from the original on April 9, 2012. Retrieved April 9, 2012.
- "Champions confident". Times Daily. July 5, 1984. p. 8B. Retrieved April 14, 2012.
- AP (June 26, 1984). "Coetzee May Lose Title". Sarasota Herald-Tribune. p. 4C. Retrieved April 14, 2012.
- Cliff Rold (October 31, 2012). "Mijares vs. Darchinyan: The Pre-Fight Report Card". BoxingScene.com. Retrieved April 14, 2012.
- Ronnie Nathanielsz (April 29, 2010). "WBC vs. WBO Rift Over Hasegawa-Montiel Involvement". BoxingScene.com. Retrieved April 14, 2012.
- "Welcome to the Oriental and Pacific Boxing Federation website". OPBF. 2013. Retrieved March 10, 2013.
- Kazuto Harada (February 22, 2011). "Koki Kameda I'll Fight Nonito Donaire at Anytime!". BoxingScene.com. Retrieved March 31, 2011.
- 委員長会議報告書 (in Japanese). Japan Boxing Commission. March 9, 2011. Retrieved April 14, 2012.
- Boxing Beat editorial department (February 18, 2013). "WBO承認加盟会見 4月1日からIBFも" (in Japanese). MACC Publications Inc. Retrieved February 19, 2013.
- Ronnie Nathanielsz (February 17, 2013). "Japan at long last recognizes the WBO". PhilBoxing.com. Retrieved February 19, 2013.
- Joseph R. Svinth (October 2011). "Death under the Spotlight: The Manuel Velazquez Collection, 2011 – Table 9: Cities reporting six or more boxing deaths, 1950-2011" (PDF). EJMAS. p. 15. Retrieved March 8, 2013.
- Boxing Beat editorial department (February 23, 2010). "八巻裕一選手死亡 JBC設立後37例目の犠牲者" (in Japanese). MACC Publications Inc. Retrieved March 8, 2013.
- "Japanese Boxer Dies 18 Hours After Collapsing". The Press-Courier. January 28, 1973. p. 20. Retrieved March 9, 2013.
- Baseball Magazine Sha 2005, p. 188.
- Joseph R. Svinth (2011). "Death under the Spotlight: The Manuel Velazquez Boxing Fatality Collection – The Data (pdf)" (PDF). Journal of Combative Sport. Retrieved March 8, 2013.
- "Fatal Prizefight – Yokohama Pugilist Died After Sparring With Jack Slavin". The Morning Oregonian. February 5, 1902. p. 5. Retrieved March 9, 2013.
- Baseball Magazine Sha 2004, p. 289.
- G Ohhashi; S Tani; S Murakami; M Kamio; T Abe; J Ohtuki (October 2002). "Problems in health management of professional boxers in Japan". British Journal of Sports Medicine (from National Center for Biotechnology Information). BMJ Group. 36 (5): 346–353. doi:10.1136/bjsm.36.5.346. PMC . PMID 12351332.
- "Japanese Boxer Dies". The Evening Independent. March 9, 1970. p. 3C. Retrieved March 8, 2013.
- "Japanese Fighter Critical After KO". St. Petersburg Times. March 9, 1970. p. 2C. Retrieved March 8, 2013.
- Joe Koizumi (January 7, 2014). "Japanese boxer Okada passes away". Fightnews.com. Retrieved January 8, 2014.
- Boxing Magazine editorial department, ed. (May 31, 2002). 日本プロボクシング史 世界タイトルマッチで見る50年 (Japan Pro Boxing History – 50 Years of World Title Bouts) (in Japanese). Tokyo, Japan: Baseball Magazine Sha Co., Ltd. pp. 40–41, 78, 286, 291. ISBN 978-4-583-03695-3.
- Boxing Magazine editorial department, ed. (March 1, 2004). 日本プロボクシングチャンピオン大鑑 (in Japanese). Tokyo, Japan: Baseball Magazine Sha Co., Ltd. pp. 66, 67, 172, 242, 289. ISBN 978-4-583-03784-4.
- Jake Donovan (April 2012). "Upset of the Year". The Ring. No. May 2012 issue. Pennsylvania, United States: Sports and Entertainment Publications, LLC. pp. 44–45.
- Boxing Beat editorial department (October 15, 2011). MACC Publications Inc, ed. 村田が銀 & 五輪切符獲得. Ironman. Boxing Beat (in Japanese). Tokyo, Japan: Fitness Sports Co., Ltd. (special issue): 109.
- Boxing Beat editorial department (February 15, 2012). MACC Publications Inc, ed. 湯場、ついに4階級制覇成す. Ironman. Boxing Beat (in Japanese). Tokyo, Japan: Fitness Sports Co., Ltd. (special issue): 29.
- Asazawa, Ei; Shibuya, Jun (September 10, 2007). 移籍騒動の高山、問題収束せぬまま10月に再起. Boxing Magazine (in Japanese). No. October 2007 issue. Tokyo, Japan: Baseball Magazine Sha Co., Ltd. p. 61.
- Shigeru Masuda (September 10, 2007). 熱いぞ! とてつもなく熱いぞ!! フィリピン・リングの「今」と「昔」. Boxing Magazine (in Japanese). No. October 2007 issue. Tokyo, Japan: Baseball Magazine Sha Co., Ltd. p. 55.
- Boxing Magazine editorial department (with Japan Boxing Commission, Japan Pro Boxing Association), ed. (April 30, 2005). "ボクシング百科全書 – リング禍". 日本ボクシング年鑑2005 (Japan Boxing Year Book 2005) (in Japanese). Tokyo, Japan: Baseball Magazine Sha Co., Ltd. p. 188. ISBN 978-4-583-03849-0.
|Wikimedia Commons has media related to Boxing in Japan.|
- Official website of Japan Amateur Boxing Federation (JABF) (in Japanese)
- Official website of Japan Boxing Commission (JBC) (in Japanese)
- JBC rules West Japan Boxing Association (in Japanese)
- Official website of Japan Pro Boxing Association (JPBA) (in Japanese)