Jin Sasaki

Professional career Sasaki had his debut fight on August 24, 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. With this win, he qualified for the Japan Super Lightweight Championship.

On October 19, 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 1 minute 58 seconds. At the weigh-in the day before, Sasaki was overweight by 4 pounds and was disqualified from winning the title.

On October 25, 2021, the Japan Boxing Commission (JBC) suspended Sasaki's license for 6 months after he missed weight for the second time, and collected 20% of the fight purse as a fine.

On July 9, 2022, at Esforta Arena Hachioji, Sasaki fought Kotaro Sekine. The fight ended in a draw, where both fighters were knocked down.

On January 14, 2023, Sasaki fought for the vacant WBO Asia-Pacific welterweight title at Korakuen Hall, defeating champion Ryota Toyoshima by TKO in the first round in 1 minute and 56 seconds.

Sasaki won by unanimous decision against Shoki Sakai at Ariake Arena in Tokyo, Japan on January 24, 2025.

Sasaki was knocked out by Brian Norman Jr. at the WBO welterweight title match at Ota City General Gymnasium in Tokyo on June 19, 2025.

He challenged Oriental and Pacific Boxing Federation welterweight champion Sora Tanaka at the Tokyo Dome on 2 May 2026, winning via split decision.

Professional boxing record