|Height||5 ft 6 1⁄2 in (169 cm)|
|Reach||68 1⁄2 in (174 cm)|
|Born||July 25, 1976|
Kakogawa, Hyōgo, Japan
|Wins by KO||24|
Toshiaki Nishioka (西岡 利晃 Nishioka Toshiaki, born July 25, 1976) is a Japanese former professional boxer who competed from 1994 to 2012. He held the WBC super bantamweight title from 2008 to 2012, and challenged for the lineal super bantamweight title in his final fight. Nishioka is known for his series of fights against Veeraphol Nakonluang-Promotion, with two of their four encounters ending in draws. Unlike many of Japan's other world champions, Nishioka willingly fought outside of his own country.
Early life and career
Nishioka was born in Kakogawa, Hyōgo, Japan, in July 1976, and has one younger sister. He started boxing at age ten when he was in the fifth grade of elementary school on the recommendation of his father who runs a tavern. He compiled an amateur record of 10–2. Since before his professional debut, Nishioka had served as a sparring partner of the reigning WBC bantamweight champion Yasuei Yakushiji.
Nicknamed "Speed King", Nishioka won his professional debut by a first-round knockout in Himeji, Hyōgo, on December 11, 1994. But he was knocked out in the fourth round of the next fight at the Korakuen Hall, and was carried out on a stretcher. Nishioka won the annual Japanese boxing series, West Japan Rookie King Tournament in the super bantamweight division at the Osaka Prefectural Gymnasium in September 1995. Winning over the Central Japan rookie king in the next fight at the Nagoya Civic Assembly Hall, he fought against the rookie king of the Western part of Japan in Fukuoka in December of the same year. Though Nishioka was convinced of his victory, the judges were in favor of his opponent.
During his early career, Nishioka was expected to be Joichiro Tatsuyoshi's successor, and served as his sparring partner for two years since 1996. Nishioka went down a weight division to capture the Japanese bantamweight title at the Osaka Municipal Central Gymnasium on December 29, 1998, the last day when Tatsuyoshi was a world champion. Although Nishioka was knocked down once when away from the clinch in the first round, he twice floored his opponent while wearing a confident and defiant smile in the second round to be crowned, and defended the title twice before returning it.
Rivalry with Sahaprom, injuries
In June 2000, Nishioka challenged the WBC bantamweight champion Veeraphol Nakonluang-Promotion in Takasago, Hyōgo, and lost via a unanimous decision. He had belonged to the JM Kakogawa Gym until that fight, and has been managed by the Teiken Boxing Gym in Tokyo under Akihiko Honda's supervision and Yūichi Kasai's guidance since September 2000.
The second world title shot was watched by 12,000 spectators at the Yokohama Arena in September 2001, and was a very close fight in which the scores were 115–113 for Nishioka, 116–113 for Veeraphol, and 114–114 even. Nishioka suffered an Achilles tendon rupture twice during that year. In December 2002, he returned to the ring for the first time in fifteen months to gain a first-round knockout victory at the Mandalay Bay Resort and Casino in Las Vegas, Nevada. However his style was totally different from the previous one. He challenged Veeraphol for the third time at the Ryōgoku Kokugikan in October 2003, but the result was a draw by a hometown decision. In his fourth world title shot against Veeraphol in March 2004, he lost via a unanimous decision by a wide margin of points at the Saitama Super Arena.
After that defeat in 2004, Nishioka received a greeting card, with the Japanese message Kono michi yori ikiru michi nashi (この道より生きる道なし) written by painter Atsumu Yamamoto; the phrase can be interpreted as: "No way to live other than this way", which encouraged him. While Honda advised him to retire, and set subsequent matches to convince him, Nishioka, who had remained aloof and proud as a boxer and had not trained with gym mates, decided to run with younger fellow boxers to strengthen his mind. He also attended Marco Antonio Barrera's training camp on the West Coast of the United States.
Marriage and recovery
Nishioka got married in January 2005, and they have a daughter born in 2006. Nishioka went back to the super bantamweight division, and continued fighting mainly in Japan, besides a second-round technical knockout victory at the Palais des Sports in Marseille, France, in April 2005, and a fourth-round knockout victory (with a left-hand punch to the body) at The Joint in Las Vegas, Nevada, in November 2006. Nishioka noticed that the former motion before the Achilles tendon injury came back in the pivot of his ankle from around the fight in November 2006. His trainer Kasai also felt that Nishioka's foot recovered to its original condition, and his thinking and fighting style progressed significantly from around the fight in December 2007 or in April 2008.
After the fight in December 2007, Nishioka stayed at his wife's parents' home in Amagasaki, Hyōgo. With the consent of his wife and her father, he decided to live separate from his wife and daughter to focus on boxing alone. When he returned to Tokyo and told Honda about it, he was told that the possibility that his fifth world title was determined to be less than ten percent and that he should bring her back immediately. The discomfort in his foot completely disappeared in the beginning of 2008. From that year, he is registered as a resident in Amagasaki where his own house has been completed in 2012. Usually, Nishioka trains while living a solo life in Tokyo, and his wife and daughter live in Amagasaki. After each of Nishioka's fights, he spends time together with his family in Amagasaki. Nishioka later recalled that transfer to the Teiken Boxing Gym and marriage have been his major turning points.
WBC super bantamweight champion
Nishioka captured the WBC super bantamweight interim title against Thai's Napapol Kiatisakchokchai at the Pacifico Yokohama on September 15, 2008. Just after the fight, Veeraphol whom he fought four times, and who served as Napapol's special coach, climbed into the ring to congratulate Nishioka. Nishioka inherited the fullversion of the WBC super bantamweight title on December 18 of that year, when its previous holder, Israel Vázquez, was stripped for medical reasons. He defended that title by knocking out Mexico's Genaro García in the final round, again at the Pacifico Yokohama on January 3, 2009.
On May 23, 2009, Nishioka successfully defended his title against Jhonny González in front of 12,000 spectators mostly cheering for González at the Monterrey Arena in Mexico which had an outbreak of the H1N1 influenza. Nishioka recovered from a knockdown on the first round and went to knock out González in the third round. Nishioka's left blows including his left crosses have often been called Monster Left from those days. He succeeded in the third defense via a third-round technical knockout (TKO) against Ivan Hernández at the Yoyogi National Gymnasium on October 10 of the same year. Nishioka was presented with the 2009 WBC Knockout of the Year. He defeated Filipino Balweg Bangoyan via a fifth-round technical knockout at the Nippon Budokan on April 30, 2010 to have four consecutive title defenses all by knockout. The effects of trunk strengthening from the late 2009 have appeared, his balance has improved markedly.
On October 24 of the same year, Nishioka fought a mandatory bout against Rendall Munroe at the Ryōgoku Kokugikan, and defeated him by a convincing unanimous decision to extend his defending streak to five matches. Nishioka strongly desired a unification match with the other organizations' champion especially after that. When Nishioka was named Japan's Fighter of the Year in 2010, he received a video message from Fernando Montiel demanding a fight at the awards ceremony in January 2011. Nishioka said he was willing to fight anytime soon afterward and his camp intended to arrange a match, but the contract was not finalized as Montiel lost to Nonito Donaire in February. On April 8, 2011, he knocked out Argentina's Mauricio Javier Muñoz in the ninth round in his sixth defense which was moved from the Ryōgoku Kokugikan in Tokyo to the World Memorial Hall in Kobe due to the Tōhoku earthquake.
In his seventh defense on October 1, 2011, Nishioka fought against Rafael Márquez, who had been marked as one of his targets from around October 2003, at the MGM Grand Marquee Ballroom in Las Vegas. Márquez's long, well-extended jabs were effective in the early rounds. At the end of four rounds, all three judges scored it identically at 39–37 in favor of Márquez. Nishioka fully concentrated every second from the beginning of the fight. He landed well-timed left and right blows while circling right to nullify Márquez's right cross, and although not in principle for a southpaw, often circling left to negate Márquez's left hook and to throw his quicker and sharper angled left, to win the bout by a unanimous decision. Although Márquez did not admit his defeat and demanded a rematch, there was no disgust nor booing among the spectators.
Nishioka lost to Nonito Donaire by technical knockout in 1:54 in the ninth round at the Home Depot Center in Carson, California on October 13, 2012. He had been ranked the number one super bantamweight in the world by The Ring, but was dropped to number three after the fight.
About a month following his bout with Donaire, Nishioka announced his retirement from boxing.
Professional boxing record
|Professional record summary|
|47 fights||39 wins||5 losses|
|47||Loss||39–5–3||Nonito Donaire||TKO||9 (12), 1:54||2012-10-13||Home Depot Center, Carson, California, U.S.||For WBO, vacant The Ring and lineal super bantamweight titles|
|46||Win||39–4–3||Rafael Márquez||UD||12||2011-10-01||MGM Grand Marquee Ballroom, Paradise, Nevada, U.S.||Retained WBC super bantamweight title|
|45||Win||38–4–3||Mauricio Javier Muñoz||KO||9 (12), 3:07||2011-04-08||World Memorial Hall, Kobe, Japan||Retained WBC super bantamweight title|
|44||Win||37–4–3||Rendall Munroe||UD||12||2010-10-24||Ryōgoku Kokugikan, Tokyo, Japan||Retained WBC super bantamweight title|
|43||Win||36–4–3||Balweg Bangoyan||TKO||5 (12), 1:14||2010-04-30||Nippon Budokan, Tokyo, Japan||Retained WBC super bantamweight title|
|42||Win||35–4–3||Ivan Hernández||RTD||3 (12), 3:00||2009-10-10||Yoyogi National Gymnasium, Tokyo, Japan||Retained WBC super bantamweight title|
|41||Win||34–4–3||Jhonny González||TKO||3 (12), 1:20||2009-05-23||Monterrey Arena, Monterrey, Mexico||Retained WBC super bantamweight title|
|40||Win||33–4–3||Genaro García||TKO||12 (12), 0:57||2009-01-03||Pacifico, Yokohama, Japan||Retained WBC super bantamweight title|
|39||Win||32–4–3||Napapol Kiatisakchokchai||UD||12||2008-09-15||Pacifico, Yokohama, Japan||Won WBC interim super bantamweight title|
|38||Win||31–4–3||Jesús García||TKO||3 (8), 0:43||2008-04-19||Korakuen Hall, Tokyo, Japan|
|37||Win||30–4–3||Pederito Laurente||KO||9 (10), 0:48||2007-12-15||Korakuen Hall, Tokyo, Japan|
|36||Win||29–4–3||Jean Javier Sotelo||KO||7 (10), 0:23||2007-08-11||Korakuen Hall, Tokyo, Japan|
|35||Win||28–4–3||José Alonso||KO||4 (8), 2:59||2006-11-16||The Joint, Paradise, Nevada, U.S.|
|34||Win||27–4–3||Hugo Vargas||UD||10||2006-02-04||Korakuen Hall, Tokyo, Japan|
|33||Win||26–4–3||Pederito Laurente||UD||10||2005-09-03||Korakuen Hall, Tokyo, Japan|
|32||Win||25–4–3||Mustapha Abahraouhi||TKO||2 (8), 2:00||2005-04-29||Palais des sports, Marseille, France|
|31||Win||24–4–3||Yoshikane Nakajima||UD||10||2004-10-30||Ryōgoku Kokugikan, Tokyo, Japan|
|30||Loss||23–4–3||Veeraphol Sahaprom||UD||12||2004-03-06||Super Arena, Saitama, Japan||For WBC bantamweight title|
|29||Draw||23–3–3||Veeraphol Sahaprom||SD||12||2003-10-04||Ryōgoku Kokugikan, Tokyo, Japan||For WBC bantamweight title|
|28||Win||23–3–2||Evangelio Pérez||KO||1 (6), 1:32||2002-12-07||Mandalay Bay Events Center, Paradise, Nevada, U.S.|
|27||Draw||22–3–2||Veeraphol Sahaprom||SD||12||2001-09-01||Yokohama Arena, Kanagawa, Japan||For WBC bantamweight title|
|26||Win||22–3–1||Sammy Ventura||KO||1 (10), 2:00||2001-03-11||Yokohama Arena, Kanagawa, Japan|
|25||Win||21–3–1||Gerardo Martínez||UD||10||2000-11-05||Korakuen Hall, Tokyo, Japan|
|24||Loss||20–3–1||Veeraphol Sahaprom||UD||12||2000-06-25||City Sogo Sports Center, Takasago, Japan||For WBC bantamweight title|
|23||Win||20–2–1||Rodel Llanita||KO||2 (10), 2:51||2000-03-12||Ryōgoku Kokugikan, Tokyo, Japan|
|22||Win||19–2–1||Taiji Okamoto||UD||10||1999-12-19||City Gymnasium, Takasago, Japan||Retained Japanese bantamweight title|
|21||Win||18–2–1||Yodsingh Chuwatana||TKO||4 (10), 1:13||1999-08-07||Korakuen Hall, Tokyo, Japan|
|20||Win||17–2–1||Shigeru Nakazato||TKO||8 (10), 1:21||1999-04-24||Kakogawa, Japan||Retained Japanese bantamweight title|
|19||Win||16–2–1||Jun'ichi Watanabe||KO||2 (10), 1:55||1998-12-29||Municipal Central Gymnasium, Osaka, Japan||Won vacant Japanese bantamweight title|
|18||Win||15–2–1||Joel Avila||KO||2 (10), 0:23||1998-09-23||General Gymnasium, Takasago, Japan|
|17||Win||14–2–1||Jack Siahaya||KO||1 (10), 0:43||1998-06-29||Prefectural Gymnasium, Osaka, Japan|
|16||Win||13–2–1||Julio César Cardona||DQ||5 (10), 2:58||1998-03-08||Yokohama Arena, Yokohama, Japan||Cardona disqualified for repeated low blows|
|15||Win||12–2–1||Dong-Soo Kim||TKO||4 (10), 3:01||1997-11-22||Osaka-jō Hall, Osaka, Japan|
|14||Draw||11–2–1||Fernando Montilla||SD||10||1997-08-30||Himeji, Japan|
|13||Win||11–2||Joel Junio||KO||2 (10), 2:53||1997-04-14||Prefectural Gymnasium, Osaka, Japan|
|12||Win||10–2||Fuzi Armes||KO||6 (10), 2:40||1997-02-23||Himeji, Japan|
|11||Win||9–2||Ahmad Fandi||UD||10||1996-10-19||Kobe, Japan|
|10||Win||8–2||Donaldo Estella||UD||6||1996-08-25||Himeji, Japan|
|9||Win||7–2||Reynante Rojo||UD||8||1996-05-19||Okinoerabujima, Japan|
|8||Loss||6–2||Momotarō Kitajima||MD||6||1995-12-16||Fukuoka, Japan|
|7||Win||6–1||Shin Kashiramoto||UD||6||1995-10-29||Civic Assembly Hall, Nagoya, Japan|
|6||Win||5–1||Isao Ohno||UD||6||1995-09-18||Prefectural Gymnasium, Osaka, Japan|
|5||Win||4–1||Hiroyasu Uchida||KO||1 (4), 1:31||1995-08-15||Prefectural Gymnasium, Osaka, Japan|
|4||Win||3–1||Nobuyuki Kihara||UD||4||1995-06-17||Himeji, Japan|
|3||Win||2–1||Shigeaki Nakamasa||KO||1 (4), 2:41||1995-03-25||Himeji, Japan|
|2||Loss||1–1||Masahiko Nakamura||KO||4 (4), 2:12||1995-02-04||Korakuen Hall, Tokyo, Japan|
|1||Win||1–0||Yūkō Shishido||KO||1 (4), 2:55||1994-12-11||Himeji, Japan||Professional debut|
- List of WBC world champions
- List of super bantamweight boxing champions
- List of Japanese boxing world champions
- Boxing in Japan
- Marty Mulcahey (September 30, 2011). "The Weekend TV Cheat Sheet Part One". Max Boxing. Retrieved October 6, 2011.
- Ziggy Shah (October 25, 2010). "Nishioka defeats Munroe". East Side Boxing.com. Retrieved October 25, 2010.
- Lee Groves (January 11, 2012). "10 Best junior featherweights of all time". The Ring. p. 3. Retrieved January 20, 2012.
- Alexey Sukachev (October 24, 2010). "Toshiaki Nishioka Breaks Down a Brave Rendall Munroe". BoxingScene.com. Retrieved October 25, 2010.
- Hisao Adachi (April 6, 2011). "Púgiles cumplen con exámenes en Japón" (in Spanish). NotiFight.com. Retrieved April 9, 2011.
- Dan Rafael (October 3, 2011). "Martinez gets the job done – Toshiaki Nishioka W12 Rafael Marquez". ESPN. Retrieved October 3, 2011.
- 不安だけど…休養は必要. Kobe Shimbun (in Japanese). April 28, 1999. Archived from the original on July 22, 2011. Retrieved February 28, 2011.
- Masahiro Miyazaki 2010, p. 18
- Masahiro Miyazaki 2010, p. 17
- 西岡先輩 頑張って. Kobe Shimbun (in Japanese). March 17, 1999. Archived from the original on July 22, 2011. Retrieved February 28, 2011.
- Baseball Magazine Sha 2004, p. 223.
- Toshiki Sunohara 1999, p. 43
- Isao Hara (September 3, 2011). 世界チャンピオン・西岡利晃の軌跡 (1) – 天才少年の挫折 (in Japanese). WOWOW. Retrieved September 3, 2011.
- Isao Hara (November 10, 2011). "WBC世界スーパーバンタム級王者 西岡利晃「20代の自分と戦ったら? 今の僕が勝つのは間違いない」" (in Japanese). Shueisha. Retrieved May 20, 2012.
- Mario Kumekawa (September 28, 2010). 進化する西岡利晃 10月24日に防衛戦 (in Japanese). Kyodo News – 47news.jp. Retrieved October 23, 2010.
- 辰吉の練習相手で急成長／兵庫から目指せ世界. Kobe Shimbun (in Japanese). June 20, 1998. Archived from the original on July 22, 2011. Retrieved February 28, 2011.
- Nippon Sports Publishing 2000, p. 8.
- "Boxing Records – Tuesday 29 December 1998; Central Gym, Osaka, Osaka, Japan". BoxRec. Retrieved February 28, 2011.
- 西岡、「来年、日本で最初の統一王者になる」…2010報知プロスポーツ大賞 (in Japanese). Sports Hochi. December 16, 2010. Archived from the original on July 22, 2011. Retrieved January 6, 2012.
- 西岡の左はミットの上からでも骨を砕く 〜トレーナーが明かす世界王者の強さ〜 (in Japanese). Sports Communications. August 19, 2010.
- Baseball Magazine Sha 2002, p. 170.
- Associated Press (September 1, 2001). "Veeraphol holds onto title". ESPN. Retrieved December 16, 2010.
- Makoto Maeda (January 11, 2011). "なお進化を遂げる西岡、30代世界王者の充実度。〜Sバンタム級6度目の防衛へ〜" (in Japanese). Bungeishunjū. Retrieved February 26, 2011.
- "Nishioka pulls out of boxing doubleheader". The Japan Times. December 26, 2001. Retrieved December 16, 2010.
- "Holyfield downed, nearly out". The Age. October 6, 2003. Retrieved December 16, 2010.
- "Larios sees off Nakazato". BBC. March 6, 2004. Retrieved December 16, 2010.
- Jun Taguchi (September 11, 2008). 西岡恩人の画家山本集氏にベルト奪取誓う. Nikkan Sports (in Japanese). Retrieved August 16, 2011.
- Jun Taguchi (September 16, 2008). 西岡5度目で世界の頂点. Nikkan Sports (in Japanese). Retrieved February 26, 2011.
- 西岡"5度目の正直"で世界獲った. Sports Nippon (in Japanese). September 16, 2008. Retrieved February 26, 2011.
- 西岡が結婚 (in Japanese). boxing.jp. January 11, 2005. Retrieved February 28, 2011.
- Hisao Adachi (May 9, 2005). "Noticias del boxeo japonés" (in Spanish). BoxeoMundial.net. Retrieved October 30, 2011.
- David A. Avila (November 15, 2006). "Bobby Pacquiao Loses by DQ Against Hector Velazquez in Las Vegas". The Sweet Science. Retrieved October 30, 2011.
- Masahiro Miyazaki 2010, p. 16
- Ninomiya, Toshio (June 9, 2011). 3人の世界王者。帝拳ジム、最強の秘密. Sports Graphic Number. ナンバーノンフィクション99 (in Japanese). Tokyo, Japan: Bungeishunju. 32 (12): 81.
- 西岡5度目の挑戦で世界をつかむ. Nikkan Sports (in Japanese). July 1, 2008. Retrieved February 29, 2012.
- Eiji Fujinaka (October 3, 2011). "西岡快挙! ベガスでV7". Nikkan Sports (in Japanese). Retrieved October 12, 2011.
- "尼崎の西岡"市役所訪問で猛烈アピール. Daily Sports (in Japanese). June 3, 2010. Archived from the original on June 5, 2010. Retrieved August 16, 2011.
- Hisao Adachi (September 15, 2008). "¡Nishioka captura la diadema interina supergallo!" (in Spanish). Notifight.com. Retrieved December 16, 2010.
- Associated Press (January 3, 2009). "Nishioka keeps super bantamweight title". ESPN. Retrieved February 11, 2010.
- Ray Brewer (September 30, 2011). "Japanese fighter Nishioka looking to extend his popularity to the U.S." Las Vegas Sun. Retrieved October 3, 2011.
- Dan Rafael (April 2, 2011). "Judah in champion Marquez's sights – Quick hits". ESPN. Retrieved January 14, 2012.
- Joe Koizumi (April 6, 2011). "M. Sulaiman moves audience". Fightnews.com. Archived from the original on April 4, 2012. Retrieved January 14, 2012.
- Chris Cozzone (May 24, 2009). "Buenos Noches, Monterrey – Nishioka puts out Gonzalez in title defense; Marquez stages return". Fightnews.com. Retrieved February 11, 2010.
- Joe Koizumi (October 10, 2009). "Shocker: Salgado destroys Linares – Nishioka successfully defends title". Fightnews.com. Retrieved February 11, 2010.
- Boxing Bob Newman (July 31, 2010). "WBC awards banquet". Fightnews.com. Retrieved August 2, 2010.
- Sapa-AFP (April 30, 2010). "Nishioka retains WBC title". Times LIVE. Retrieved May 1, 2010.
- "4戦連続KOだ! サウスポー西岡 "右でぶっ倒す"". Sports Nippon (in Japanese). April 24, 2010. Archived from the original on April 26, 2010. Retrieved February 29, 2012.
- Gareth A Davies (October 24, 2010). "Toshiaki Nishioka beats Rendall Munroe on points to retain WBC super-bantamweight title". The Daily Telegraph. Retrieved October 24, 2010.
- Eiji Fujinaka (January 27, 2011). "西岡利晃MVP モンティエルから挑戦状". Nikkan Sports (in Japanese). Retrieved May 20, 2012.
- 西岡対戦予定のモンティエル敗れガックリ. Nikkan Sports (in Japanese). February 21, 2011. Retrieved May 20, 2012.
- AFP (April 8, 2011). "Nishioka retains WBC title". Independent Online. Retrieved April 8, 2011.
- 西岡の狙う標的たち (in Japanese). Team Nishioka Official Homepage. February 2001 – September 2005. Archived from the original on April 7, 2005. Retrieved January 6, 2012.CS1 maint: Unfit url (link)
- German Villasenor (October 4, 2011). "German's Weekend Report". Max Boxing. Retrieved April 15, 2012.
- CompuBox (October 2, 2011). "Toshiaki Nishioka vs. Rafael Marquez - CompuBox Stats". BoxingScene.com. Retrieved February 19, 2012.
- Daisuke Yamaguchi (November 13, 2011). ボクシング・西岡、自ら語るラスベガスで勝てた理由. Nihon Keizai Shimbun (in Japanese). p. 2. Retrieved November 13, 2011.
- AP (October 3, 2011). "Nishioka retains WBC super-bantamweight title". Asahi Shimbun. Retrieved January 20, 2012.
- Joe Koizumi 2011, p. 94.
- Michael Rosenthal (October 2, 2011). "Nishioka impressive in victory over Marquez". The Ring. Retrieved October 3, 2011.
- Michael Woods (October 3, 2011). "NO CONTROVERSY HERE Nishioka Beats Rafa Marquez". The Sweet Science. Retrieved October 3, 2011.
- Michael Rosenthal (March 6, 2012). "Ring Ratings Update: Who replaces Wonjongkam on pound-for-pound list?". The Ring. Retrieved March 6, 2012.
- "WBC update in super bantamweight division". WBC. March 15, 2012. Retrieved March 16, 2012.
- Chuck Giampa (October 17, 2012). "RING Ratings Update: Hoping for Donaire-Rigondeaux soon". The Ring. Retrieved October 19, 2012.
- Ronnie Nathanielsz (November 14, 2012). "DONAIRE EARNS DISTINCTION OF BEATING CHAMPIONS AND MAKING THEM RETIRE". PhilBoxing.com. Retrieved 2012-11-14.
- Masahiro Miyazaki (April 10, 2010). "The Biography 世界チャンピオンの肖像 天才は孤高の隘路を歩き続ける". Boxing Magazine (in Japanese). No. April 2010 issue. Tokyo, Japan: Baseball Magazine Sha Co., Ltd. pp. 16–18.
- Boxing Magazine editorial department, ed. (March 1, 2004). "西岡利晃". 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. p. 223. ISBN 978-4-583-03784-4.
- Toshiki Sunohara (April 27, 1999). ポスト辰吉を狙う国内バンタム級. World Boxing (in Japanese). Tokyo, Japan: Nippon Sports Publishing Co., Ltd. (special issue): 43.
- ライバルをぶっ倒せ!. World Boxing (in Japanese). Tokyo, Japan: Nippon Sports Publishing Co., Ltd. (special issue): 8. April 18, 2000.
- 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. p. 170. ISBN 978-4-583-03695-3.
- Joe Koizumi (October 15, 2011). MACC Publications Inc (ed.). ジョー小泉のボクシングは技術だ. Ironman. Boxing Beat (in Japanese). Tokyo, Japan: Fitness Sports Co., Ltd. (special issue): 94.
- Boxing Magazine editorial department (with Japan Boxing Commission, Japan Pro Boxing Association), ed. (April 30, 2005). "2004年出場選手全戦績". 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. 133. ISBN 978-4-583-03849-0.
- Team Nishioka Official Homepage at the Wayback Machine (archived August 30, 2005) ‹See Tfd›(in Japanese)
- Professional boxing record for Toshiaki Nishioka from BoxRec
- Toshiaki Nishioka's blog ‹See Tfd›(in Japanese)
|Regional boxing titles|
Title last held byShin Yamato
| Japanese bantamweight champion
December 29, 1998 – March 2000
Title next held byNobuaki Naka
|World boxing titles|
Title last held byÓscar Larios
| WBC super bantamweight champion
September 15, 2008 – December 18, 2008
Title next held byJulio Ceja
| WBC super bantamweight champion
December 18, 2008 – March 15, 2012
Title next held byAbner Mares