is a Japanese professional boxer who has held the WBA (Regular) mini-flyweight title since September 2026.
Kickboxing career According to a report on fightnews.com, Ishii had a kickboxing career.
Professional boxing career Early career Ishii made his professional boxing debut on 19 May 2022 at the Korakuen Hall in Tokyo, Japan against compatriot Takato Fukuda in a scheduled 4-rounds bout. Ishii won via 2nd-round TKO.
After a seven fight win streak, on 12 September 2023, Ishii lost via an upset against veteran Filipino Lito Dante via 8-rounds split decision. One judge scored it 77–75 in favour of Masuda, and the two other judges scored it 77–75 in favour of Dante, handing Masuda his first professional career loss.
OPBF mini flyweight champion On 25 September 2024, Ishii was scheduled to face unbeaten Filipino John Kevin Jimenez for the vacant OPBF mini flyweight championship, which had been officially vacant for more than three years. Ishii won via narrow UD to claim the vacant title.
Ishii was scheduled to make the first defence of his OPBF title against 13–6–2 Japanese Shunsuke Isa on 11 March 2025 in Tokyo, Japan. Ishii won via fifth-round KO.
Ishii made the second defence of his OPBF title against multiple-time regional challenger Jake Amparo on 9 September 2025 in Tokyo, Japan, scheduled for 10 rounds. Ishii won via lop-sided UD.
WBA (Regular) mini flyweight champion Ishii vs. Méndez Following the uncertainty of fighting the then reigning WBA mini flyweight champion Oscar Collazo, Ishii was subsequently scheduled to face former WBO mini flyweight champion Wilfredo Méndez for the vacant 'Regular' title on 2 September 2026 at the Yokohama Buntai in Yokohama, Japan. Ishii won via quick first-round KO, finishing the bout within just 65 seconds, to claim the vacant world championship. This gave way for Ishii to obtain a new record, where he betters Naoya Inoue's record for Japan's fastest world title knockout.
Professional boxing record
ResultRecordOpponentTypeRound, timeDateLocationNotes13Win12–1Wilfredo MéndezKO1 (12), 2 Sep 202612Win11–1Jake AmparoUD109 Sep 202511Win10–1Shunsuke IsaKO5 (12), 11 Mar 202510Win9–1John Kevin JimenezUD1225 Sep 20249Win8–1Prachanon MingoranchaKO3 (8), 9 Jul 20248Loss7–1Lito Dante812 Sep 20237Win7–0Natchaphon Wichaita2 (8), 29 Jun 20236Win6–0Jinnawat RienpithTKO1 (6), 14 Mar 20235Win5–0Masashi IkedaTKO1 (5), 17 Dec 20224Win4–0Kenta Kawakami43 Nov 20223Win3–0Andy AtsushiTKO1 (4), 27 Sep 20222Win2–0Yoshiki IwaiTKO4 (4), 2 Aug 20221Win1–0Takato Fukuda2 (4), 19 May 2022
References
External links
Takeshi Ishii - Profile, News Archive & Current Rankings at Box.Live