is a Japanese professional boxer. As an amateur, Tsuboi won a gold medal at the 2021 AIBA World Boxing Championships. Tsuboi also won bronze medals at both the 2022 Asian Games and 2022 Asian Amateur Boxing Championships.
Amateur career World Championship results Belgrade 2021 First round: Defeated Manuel Cappai (Italy) 5–0 Second round: Defeated Shakhobidin Zoirov (Uzbekistan) 3–2 Quarter-finals: Defeated Jabali Breedy (Barbados) 5–0 Semi-finals: Defeated Billal Bennama (France) 4–1 Final: Defeated Makhmud Sabyrkhan (Kazakhstan) 5–0
Tashkent 2023 Round of 32: Defeated Vasilii Egorov (Russia) 4–1 Round of 16: Defeated David Karanja (Kenya) 5–0 Quarter-finals: Defeated by Hasanboy Dusmatov (Uzbekistan) 4–3
Asian Games result Hangzhou 2021 Round of 16: Defeated Deepak Bhoria (India) 5–0 Quarter-finals: Defeated Nurzhigit Diushebaev (Kyrgyzstan) 5–0 Semi-finals: Defeated by Hasanboy Dusmatov (Uzbekistan) 4–1
Asian Championship result Amman 2022 Round of 16: Defeated Azat Makhmetov (Kazakhstan) 5–0 Quarter-finals: Defeated Po Wei Tu (Taiwan) 5–0 Semi-finals: Defeated by Saken Bibossinov (Kazakhstan) 5–0
Professional career On 13 March 2025, Tsuboi made his professional debut in a bout against Boonrueang Phayom. In the second round, Tsuboi scored a knockdown after landing a shot to the body of his opponent. Phayom was able to recover from the knockdown, but was dropped for a second time later in the round which resulted in the referee opting to call an end to the bout. On 8 June 2025, Tsuboi faced Trần Văn Thảo for the vacant WBO Asia Pacific bantamweight title. Tsuboi was able to secure the win after outboxing his opponent for the majority of the bout.
In just his fifth professional fight, Tsuboi faced Ricardo Malajika for the vacant WBC super-flyweight title at Toyota Arena in Tokyo on 27 September 2026. He lost via split decision with two of the ringside judges scoring the bout 116–112 and 115–113 respectively for his opponent, while the third had it 115–113 in his favour.
Professional boxing record
ResultRecordOpponentTypeRound, timeDateLocationNotes5LossRicardo Malajika 12Sep 27, 20264Pedro Guevara2 (10), Apr 11, 20263Win3–0Carlos CuadrasTKO8 (10), 24 Nov 20252Win2–0Trần Văn Thảo108 Jun 20251Win1–0Boonrueang Phayom2 (8), 13 Mar 2025
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