Oz Academy Openweight Championship

Oz Academy Openweight Championship
Current design of the championship (2019 – present)
Details
PromotionOz Academy
Date establishedOctober 23, 2006
Current championHiroyo Matsumoto
Date wonFebruary 8, 2026
Statistics
First championAja Kong
Most reignsMayumi Ozaki (4 reigns)
Longest reignAkino
(537 days)
Shortest reignMio Shirai
(4 hours, 2 minutes)
Oldest championMayumi Ozaki
(55 years, 183 days)
Youngest championYoshiko
(24 years, 95 days)
Heaviest championAja Kong
(103 kg (227 lb)))
Lightest championChikayo Nagashima
(52 kg (115 lb)))

The Oz Academy Openweight Championship is a women's professional wrestling championship owned by the Oz Academy promotion. The reigning champion is referred to as the "Wizard of Oz". The championship, which is situated at the top of Oz Academy's championship hierarchy, was introduced on March 10, 2007, when Aja Kong defeated Chikayo Nagashima in the finals of a tournament to become the inaugural champion.

Reigns

Aja Kong was the first champion in the title's history. She also holds the records for most reigns, with three. Akino holds the record for the longest reign, at 537 days, achieved on her first reign. Mio Shirai's only reign of four hours and two minutes is the shortest in the title's history. Overall, there have been a total of thirty-three reigns shared among twenty different wrestlers. Hiroyo Matsumoto is the current champion in her second reign.

Title history

Key
No. Overall reign number
Reign Reign number for the specific champion
Days Number of days held
Defenses Number of successful defenses
+ Current reign is changing daily
No. Champion Championship change Reign statistics Notes Ref.
Date Event Location Reign DaysDefenses
1 Aja Kong March 10, 2007 Queen Rebirth Tokyo, Japan 1 3091 Kong defeated Chikayo Nagashima in the finals of a five-woman tournament to become the inaugural champion.
2 Carlos Amano January 13, 2008 The Wizard of OZ 2008 Tokyo, Japan 1 3642
3 Mayumi Ozaki January 11, 2009 The Wizard of OZ 2009 Tokyo, Japan 1 422
4 Dynamite Kansai February 22, 2009 The Country of OZ 2009 Tokyo, Japan 1 1750
5 Aja Kong August 16, 2009 Plum Hanasaku ~ Country of OZ 2009 Tokyo, Japan 2 360
6 Manami Toyota September 21, 2009 OZ-Power is Everything - night 1 Sapporo, Hokkaido, Japan 1 930
7 Carlos Amano December 23, 2009 here is No Christmas in the Country of OZ! Tokyo, Japan 2 2001
8 Kaoru July 11, 2010 Summer Factor Tokyo, Japan 1 2734
— Vacated April 10, 2011 — — — —— The championship was vacated, when Kaoru suffered an injury and was unable to continue a three-way street fight against Aja Kong and Mayumi Ozaki, forcing the match to be ended in a no contest.
9 Aja Kong April 10, 2011 One Night in Heaven Tokyo, Japan 3 190 Kong defeated Mayumi Ozaki to win the vacant championship.
10 Ran Yu-Yu April 29, 2011 Heavenly Days in Osaka Osaka, Japan 1 860
11 Dynamite Kansai July 24, 2011 Gravity Tokyo, Japan 2 280
12 Mayumi Ozaki August 21, 2011 Plum Hanasaku ~ Country of OZ 2011 - night 2: 15th Anniversary ~ Yokohama Dreams Park Yokohama, Kanagawa, Japan 2 2170 This was a four-way elimination match, also involving Aja Kong and Shinobu Kandori.
13 Chikayo Nagashima March 25, 2012 A Kingdom of the Chaos Tokyo, Japan 1 3952 This was a Dress Up Wild Fight 30-minute Time of the Trial match.
14 Akino April 24, 2013 Wednesdays Showdown Tokyo, Japan 1 5377
15 Tsubasa Kuragaki October 13, 2014 No Answer Tokyo, Japan 1 2162
16 Akino May 17, 2015 Reincarnation - night 2 Tokyo, Japan 2 210
17 Mio Shirai June 7, 2015 Focus - night 1 Tokyo, Japan 1 <10
— Vacated June 7, 2015 Ozabun Spin-off Tokyo, Japan — —— Mio Shirai vacated the championship due to losing to Kaho Kobayashi in a non-title match.
18 Sonoko Kato August 23, 2015 Plum Hanasaku ~ Country Of OZ 2015: Yokohama Dreams Park #3 Yokohama, Kanagawa, Japan 1 2455 Kato defeated Hiroyo Matsumoto in a Last Woman Standing match to win the vacant championship. The match started off as a six-woman elimination tag team match, where Kato, Akino and Tsubasa Kuragaki faced Matsumoto, Arisa Nakajima and Hikaru Shida.
— Vacated April 24, 2016 The Artist Tokyo, Japan — —— Kato was stripped of the championship after her title defense against Hiroyo Matsumoto ended in a no contest.
19 Sonoko Kato July 18, 2016 Aja Kong 30th Anniversary ~ Summer Jumbo Kotobuki Tokyo, Japan 2 1181 Kato defeated Mayumi Ozaki in a No Holds Barred Hardcore match to win the vacant championship.
20 Hiroyo Matsumoto November 13, 2016 OZ Academy 20th Anniversary ~ Yokohama Dreams Park DK Yokohama, Kanagawa, Japan 1 3503
21 Yoshiko October 29, 2017 Yokohama Undersea Unexplored Expedition Yokohama, Kanagawa, Japan 1 2174
22 Hikaru Shida June 3, 2018 Rude in June Tokyo, Japan 1 3152
23 Mayumi Ozaki April 14, 2019 It is the Dawn of the Era Tokyo, Japan 3 7214
24 Sonoko Kato April 4, 2021 OZ Academy Silver Bullet Tokyo, Japan 3 701
25 Kaori Yoneyama June 13, 2021 OZ Academy The End Of Bright Tokyo, Japan 1 351
26 Maya Yukihi July 18, 2021 OZ Academy Tournament 25th Fortress Nagoya, Japan 1 <10
— Vacated July 18, 2021 — — — ——
27 Maya Yukihi August 18, 2021 OZ Academy Plum No Hanasaku OZ No Kuni ~ Mayumi Ozaki Debut 35th Anniversary Tokyo, Japan 2 2281 This was a four-way match, also involving Mayumi Ozaki, Saori Anou and Yumi Ohka.
28 Akino April 3, 2022 OZ Academy Battle Big Bonus In Korakuen Tokyo, Japan 3 6446
29 Mio Momono January 7, 2024 OZ Academy The Wizard Of OZ 2024 Tokyo, Japan 1 1120
30 Mayumi Ozaki April 28, 2024 OZ Academy Battle Big Bonus 2024 Tokyo, Japan 4 1823 This was a winner takes all match which was also contested for Ozaki's AAAW Single Championship.
31 Ryo Mizunami October 27, 2024 OZ Academy at Yokohama Budokan 2024 Tokyo, Japan 1 1681 The winner of the Yokohama Budokan Tournament Kyoto Ranbu got to challenge for the title.
32 Saori Anou April 13, 2025 OZ Academy Battle Big Bonus 2025 Tokyo, Japan 1 3011
33 Hiroyo Matsumoto February 8, 2026 OZ Academy OZ 30th & Ozaki 40th: Blooming With Pride Tokyo, Japan 2 275+1

Combined reigns

Three-time champion Akino, who is the longest combined-reigning champion at 1,202 days.

As of November 10, 2026.

† Indicates the current champion
Rank Wrestler No. of
reigns		 Combined
defenses		 Combined
days
1 Akino3131,202
2 Mayumi Ozaki491,172
3 Hiroyo Matsumoto †24625+
4 Carlos Amano23564
5 Sonoko Kato37433
6 Chikayo Nagashima12395
7 Aja Kong31364
8 Hikaru Shida12315
9 Saori Anou11301
10 Kaoru14273
11 Maya Yukihi21228
12 Yoshiko14217
13 Tsubasa Kuragaki12216
14 Dynamite Kansai20203
15 Ryo Mizunami11168
16 Mio Momono10112
17 Manami Toyota1093
18 Ran Yu-Yu1086
19 Kaori Yoneyama1135
20 Mio Shirai10<1

References

  1. 1 2 "Ozベルト設立の理由について". Oz Academy (in Japanese). October 23, 2006. Retrieved July 1, 2012.
  2. 1 2 3 4 5 "2007/03/10（土） 第25回Oz興行「 女王誕生 」 新宿Face 19:00～". Oz Academy (in Japanese). Archived from the original on May 18, 2007. Retrieved July 1, 2012.
  3. ↑ アジャ・コング. Oz Academy (in Japanese). Archived from the original on October 25, 2007. Retrieved July 1, 2012.
  4. ↑ 永島 千佳世. Oz Academy (in Japanese). Archived from the original on September 7, 2011. Retrieved July 1, 2012.
  5. 1 2 3 "2009/8/16（日） Oz後楽園大会 12:00～「 プラムの花咲くOzの国 2009 」". Oz Academy (in Japanese). Archived from the original on August 21, 2009. Retrieved July 1, 2012.
  6. 1 2 3 4 "2011/04/10（日） Oz新宿大会 18:00～ 「One Night In Heaven」". Oz Academy (in Japanese). Archived from the original on May 8, 2012. Retrieved July 1, 2012.
  7. 1 2 クチは災いのもと. Oz Academy (in Japanese). Ameba. June 10, 2015. Retrieved June 10, 2015.
  8. 1 2 "2008/1/13（日） Oz新宿大会 12：30～ 「 The Wizard of Oz 2008 」". Oz Academy (in Japanese). Archived from the original on September 7, 2008. Retrieved July 1, 2012.
  9. 1 2 "2009/01/11（日） Oz新宿大会 12:30～ 「The Wizard of Oz 2009」". Oz Academy (in Japanese). Archived from the original on January 22, 2009. Retrieved July 1, 2012.
  10. ↑ "2009/02/05（木） Oz新宿大会 19:00～ 「Oz-The Perfect Taboo!!」". Oz Academy (in Japanese). Archived from the original on February 11, 2009. Retrieved July 1, 2012.
  11. ↑ "2009/2/22（日） Oz後楽園大会 12：00～ 「魔性の花咲くOzの国」". Oz Academy (in Japanese). Archived from the original on February 26, 2009. Retrieved July 1, 2012.
  12. 1 2 "2009/9/21（月） Oz札幌大会 13:00～「 BJ Shop 札幌 プレゼンツ 」". Oz Academy (in Japanese). Archived from the original on November 13, 2009. Retrieved July 1, 2012.
  13. 1 2 "2009/12/23（水） Oz後楽園大会 12:00～「 Ozの国にクリスマスは無い！ 」". Oz Academy (in Japanese). Archived from the original on December 27, 2009. Retrieved July 1, 2012.
  14. 1 2 "2010/07/11（日） Oz新宿大会 12:30～ 「 Summer Factor 」". Oz Academy (in Japanese). Archived from the original on November 28, 2010. Retrieved July 1, 2012.
  15. 1 2 試合結果. Oz Academy (in Japanese). Livedoor. April 30, 2011. Retrieved February 7, 2013.
  16. 1 2 "2011/07/24（日） Oz新宿大会 12:00～ 「Gravity」". Oz Academy (in Japanese). Archived from the original on August 6, 2011. Retrieved July 1, 2012.
  17. 1 2 "2011/08/21(日) 16:00～「ﾌﾟﾗﾑの花咲くOzの国2011 Yokohama Dreams Park」". Oz Academy (in Japanese). Archived from the original on August 31, 2011. Retrieved July 1, 2012.
  18. 1 2 試合結果. Oz Academy (in Japanese). Livedoor. March 25, 2012. Retrieved August 14, 2013.
  19. 1 2 2013/04/24(水) 18:30～ 「決戦は水曜日!!」. Oz Academy (in Japanese). Archived from the original on June 12, 2013. Retrieved April 30, 2013.
  20. ↑ "【結果】Ozアカデミー10・13後楽園". Ringstars (in Japanese). Ameba. October 15, 2014. Retrieved October 18, 2014.
  21. 1 2 "2015/05/17(日) 18:00～ 「 Reincarnation 」". Oz Academy (in Japanese). Retrieved May 18, 2015.
  22. ↑ "2014/10/13(月) 12:00～ 「 No Answer 」". Oz Academy (in Japanese). Retrieved October 18, 2014.
  23. 1 2 3 "2015/06/07(日) 12:00～ 「 Focus 」". Oz Academy (in Japanese). Archived from the original on June 20, 2015. Retrieved June 17, 2015.
  24. ↑ Ozabun Spin-off～中川ともか、最後の1カウントを打ちに来たよ～. Pro Wrestling Wave (in Japanese). Retrieved June 8, 2015.
  25. 1 2 2016/04/24(日) 12:00～ Oz新宿大会 「 ～The Artist～ 」. Oz Academy (in Japanese). Retrieved April 27, 2016.
  26. 1 2 「Ozアカデミー結成20周年記念興行～Yokohama Drams Park DK～」. Oz Academy (in Japanese). Retrieved November 15, 2016.
  27. ↑ 2016/07/18(月) 12:00～ 「アジャ・コングデビュー30周年記念興行 ～Summer Jumbo 寿～」. Oz Academy (in Japanese). Retrieved July 19, 2016.
  28. 1 2 2017/10/29(日) 16:00～ 「 ～横浜海底秘境探検～ 」. Oz Academy (in Japanese). Retrieved October 31, 2017.
  29. ↑ "Hikaru Shida Wins Oz Academy Openweight Title". Squared Circle Sirens. Retrieved June 3, 2018.
  30. ↑ "Oz Academy: "It is the Dawn of the Era" Mayumi Ozaki se corona". Superluchas (in Spanish). 25 April 2019. Retrieved April 25, 2019.
  31. ↑ 【OZアカデミー】米山香織が加藤園子を破りOZアカデミー認定無差別王座を戴冠！6.13 新宿FACE『OZ25th～春嵐強襲～』＜全試合結果＞. ガジェット通信 (in Japanese). June 13, 2021. Archived from the original on June 14, 2021. Retrieved June 14, 2021.
  32. ↑ Richards, Alex (April 5, 2021). "#AndNEW: Titles Change Hands at OZ Academy Silver Bullet". lastwordonsports.com. Retrieved April 5, 2021.
  33. ↑ Daly, Wayne (June 13, 2021). "OZ Academy Results: The End Of Bright – Tokyo, Japan (6/13)". wrestling-news.net. Retrieved June 16, 2021.
  34. ↑ Oz Academy (July 18, 2021). OZアカデミー女子プロレス名古屋大会 OZ 25th～Fortress＠名古屋～. oz-academy.com (in Japanese). Retrieved July 18, 2021.
  35. ↑ Oz Academy (August 18, 2021). OZアカデミー女子プロレス後楽園ホール大会 尾崎魔弓35周年記念 プラムの花咲くOZの国～正危軍興行～. oz-academy.com (in Japanese). Retrieved August 18, 2021.
  36. ↑ Kreikenbohm, Philip (April 3, 2022). "OZ Academy Battle Big Bonus In Korakuen". cagematch.net. Retrieved April 3, 2022.
  37. ↑ Kreikenbohm, Philip (January 7, 2024). "OZ Academy The Wizard Of OZ 2024". cagematch.net. Retrieved January 7, 2024.
  38. ↑ Kreikenbohm, Philip (April 28, 2024). "OZ Academy Battle Big Bonus 2024". cagematch.net. Retrieved April 28, 2024.
  39. ↑ Kreikenbohm, Philip (October 27, 2024). "OZ Academy Kyohi Ranbu 2024". cagematch.net. Retrieved October 27, 2024.
  40. ↑ Kreikenbohm, Philip (April 13, 2025). "OZ Academy Battle Big Bonus 2025". cagematch.net. Retrieved April 13, 2025.
  41. ↑ Kreikenbohm, Philip (February 8, 2026). "OZ Academy OZ 30th & OZAKI 40th ~ Blooming With Pride". cagematch.net. Retrieved February 8, 2026.