Jin Sasaki (佐々木尽, Sasaki Jin, born 28 July 2001) is a Japanese professional boxer. He challenged for the WBO welterweight title in 2025. Sasaki has held the Oriental and Pacific Boxing Federation welterweight title since May 2026 and the WBO Asia Pacific and Japanese titles in the same weight division since September 2026. He is also a former WBO Asia Pacific super-lightweight champion.
Amateur career He started boxing in his first year of junior high school and entered Hachioji Nakaya Gym, where he practiced two or three times a week, but after entering Hachioji Takuma High School, he devoted himself to boxing. Sasaki went 1-3 as an amateur boxer.
Professional career Sasaki had his professional debut fight against Tsuyoshi Kato at Korakuen Hall in Tokyo on 24 August 2018, and won by technical knockout in the second round.
Sasaki advanced to the 2019 East Japan Lightweight Rookie of the Year final, but abstained from the East Japan Lightweight Rookie of the Year final due to being unable to make weight.
On December 26, 2020, at "Kakeru Holdings presents A-SIGN.BOXING" held at the Sumida Ward General Gymnasium, he fought Aso Ishiwaki for the Japan Super Lightweight Youth Championship, and won by technical knockout in the third round in 2 minutes and 50 seconds.
On 17 July 2021, he defended his title against Kaiki Yuba, the Japanese lightweight youth champion, at the Fujimori Gymnasium in Hachioji City, and won by knockout in the second round in two minutes and three seconds, successfully retaining the belt for the first time. With this win, he qualified for the Japanese super-lightweight championship.
On 19 October 2021, the Japanese and WBO Asia Pacific super-lightweight championship match was held at Korakuen Hall, where he fought Andy Hiraoka, who was ranked 1st in Japan and 2nd in the WBO Asia-Pacific class. Sasaki was stopped in the 11th round in one minute 58 seconds. At the weigh-in the day before, Sasaki was overweight by four pounds and was disqualified from winning the title.
On 25 October 2021, the Japan Boxing Commission (JBC) suspended Sasaki's license for six months after he missed weight for the second time, and collected 20 percent of the fight purse as a fine.
On 9 July 2022, at Esforta Arena Hachioji, Sasaki fought Kotaro Sekine. The fight ended in a draw, where both fighters were knocked down.
On 14 January 2023, Sasaki fought for the vacant WBO Asia-Pacific welterweight title at Korakuen Hall, defeating champion Ryota Toyoshima by technical knockout in the first round in one minute and 56 seconds.
Sasaki won by unanimous decision against Shoki Sakai at Ariake Arena in Tokyo, on 24 January 2025.
Sasaki challenged WBO welterweight champion Brian Norman Jr. at Ota City General Gymnasium in Tokyo on 19 June 2025. He lost by knockout in the fifth round.
He challenged Oriental and Pacific Boxing Federation welterweight champion Sora Tanaka at the Tokyo Dome on 2 May 2026, winning via split decision.
On 21 September 2026, Sasaki knocked out David Ssemujju in the sixth of their scheduled 10 round contest at Tokyo Tama Mirai Messe in Hachiōji to retain the OBPF title and add the WBO Asia Pacific and Japanese welterweight championships to his collection.
Professional boxing record
ResultRecordOpponentTypeRound, timeDateLocationNotes25WinDavid SsemujjuKO6 (10), 21 Sep 2026 24WinSora Tanaka102 May 2026 23WinMarlon PagalpalanTKO2 (8), 19 Feb 202622LossBrian Norman Jr.KO5 (12), 19 Jun 202521WinShoki SakaiUD1224 Jan 2025 20Win18–1–1Qamil BallaTKO7 (12), 3 Sep 202419Win17–1–1Joe NoynayTKO5 (12), 16 May 2024 18Win16–1–1Hiroto HoshiTKO11 (12), 8 Jul 202317Win15–1–1Keita ObaraTKO3 (12), 8 Apr 202316Win14–1–1Ryota ToyoshimaTKO1 (12), 14 Jan 202315Win13–1–1Phatiphan KrungklangTKO3 (8), 15 Nov 202214Draw12–1–1Kotaro Sekine69 Jul 202213Win12–1Marcus SmithTKO5 (8), 22 Apr 202212Loss11–1Andy HiraokaTKO11 (12), 19 Oct 202111Win11–0Kaiki YubaKO2 (8), 17 Jul 202110Win10–0Aso IshiwakiTKO3 (8), 26 Dec 20209Win9–0Tatsuya MiyazakiTKO1 (6), 23 Nov 20208Win8–0Shun AkaiwaKO1 (6), 31 Aug 20207Win7–0Tetsuya KondoTKO1 (4), 26 Sep 20196Win6–0Hikaru Sato46 Aug 20195Win5–0Vageta IshikawaTKO3 (4), 11 Jun 20194Win4–0Sirisak PimpasittaKO2 (4), 21 Apr 20193Win3–0Naoyuki TsumotoTKO1 (4), 8 Feb 20192Win2–0Ryo Kasai3 (4), 7 Nov 20181Win1–0Tsuyoshi Kato2 (4), 24 Aug 2018
References