Takeshi Ishii

is a Japanese professional boxer who has held the World Boxing Association (WBA) 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 schedule 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 via 8-rounds split decision. The judges scored it 77–75 for Masuda, and 77–75 twice for 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 mini flyweight champion Ishii vs. Méndez Following the yet to be announced vacation of the WBA mini flyweight title of Oscar Collazo, Ishii was then schedule to face former WBO mini flyweight champion Wilfredo Méndez for the vacant 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, claiming the vacant world championship.

Professional boxing record