is a Japanese professional boxer. She is a two-time IBF female atomweight champion, having held the title since April 2026 and previously from January 2024 to April 2025.
Professional career Yamanaka made her professional boxing debut on 13 December 2020, scoring a unanimous decision win over Arika Shimono at Edion Arena in Osaka.
She won the vacant WBO Asia Pacific 102-pound belt by stopping Honoka Kano in the fifth round of their bout at Tokyo's Korakuen Hall on 1 September 2022.
On 12 January 2024, Yamanaka captured the IBF female atomweight title with a unanimous decision success against defending champion Mika Iwakawa also at Korakuen Hall.
Yamanaka was scheduled to make the first defense of her title against former WBC female atomweight champion Fabiana Bytyqi at Olympiastuetzpunkt in Heidelberg, Germany, on 23 November 2024. The bout was cancelled after Bytyqi collapsed due to dehydration on the day of the weigh-in.
She faced WBC, WBA and WBO female atomweight title holder Tina Rupprecht in a contest to crown an undisputed champion for the division at the MBS Arena in Potsdam, Germany, on 5 April 2025. Yamanaka lost by majority decision with two of the ringside judges scoring the contest 99–91 and 96–95 respectively for her opponent, while the third had it a 95–95 draw.
Yamanaka became a two-time IBF female atomweight champion when she defeated the previously unbeaten Nao Ugawa via split decision for the vacant title at Korakuen Hall in Tokyo on 7 April 2026. Two of the judges awarded her the fight 97–93 and 96–94 respectively, overruling the third who gave it 96–94 for her opponent.
Personal life Sumire is the younger sister of former WBO mini-flyweight world champion Ryuya Yamanaka.
Professional boxing record
ResultRecordOpponentTypeRound, timeDateLocationNotes11Win10–1Nao UgawaSD107 Apr 202610Win9–1Megumi WatanabeUD825 Oct 20259Loss8–1Tina RupprechtMD105 Apr 20258Win8–0Mika IwakawaUD1012 Jan 20247Win7–0Pimchanok ThepjandaTKO3 (8), 15 Apr 20236Win6–0Honoka KanoTKO5 (8), 1 Sep 20225Win5–0Pichada Bunmee3 (6), 28 May 20224Win4–0Natsuki Tarui426 Nov 20213Win3–0Rin MuraiUD411 Aug 20212Win2–0Natsuki Yamada44 Apr 20211Win1–0Arika Shimono413 Dec 2020
References