is a Japanese professional tennis player. She achieved a career-high doubles ranking of world No. 20 on 22 October 2018, and peaked at No. 280 in singles on 22 February 2016. Partnered with Eri Hozumi, she reached the final of the 2018 French Open.

In doubles, she has won nine titles on the WTA Tour, two titles on the WTA Challenger Tour as well as 21 ITF Circuit titles. In singles, there is only one ITF title.

Playing for Japan Fed Cup team, she has a win–loss record of 5–1 (as of June 2024).

Career Ninomiya began playing tennis on ITF events in 2009.

She reached her biggest final at the 2018 French Open with partner Eri Hozumi, losing to sixth seeds Barbora Krejčíková and Kateřina Siniaková. The pair also reached the final of the 2023 Jiangxi Open where they lost to second seeds Laura Siegemund and Vera Zvonareva.

Alongside Nao Hibino, she was runner-up in the doubles at the 2024 Hong Kong 125 Open, losing to Monica Niculescu and Elena-Gabriela Ruse in the final.

Partnering Ulrikke Eikeri, she won the doubles title at the 2024 Hong Kong Open, defeating Shuko Aoyama and Eri Hozumi in the final which went to a deciding champions tiebreak.

Alongside Maia Lumsden, Ninomiya won the doubles title at the 2025 WTA 125 Saint-Malo Open, defeating Oksana Kalashnikova and Angelica Moratelli in the final.

Doubles performance timeline

Only main-draw results in WTA Tour, Grand Slam tournaments, Fed Cup/Billie Jean King Cup and Olympic Games are included in win–loss records and career statistics.

Tournament20162017201820192020202120222023202420252026Grand Slam tournaments Australian Open1R1R1R1R2R1R2R2R2R2R2R6–11 French OpenAAF1R1R2R1R1R2R2R3R10–9 Wimbledon2RSF1R2RNH2RA1R1R1R1R7–9 US Open1R1R1R1R1R1R1R1R2R1R1–10Win–loss1–34–35–41–41–32–41–31–43–42–43–324–39Year-end championshipsWTA Elite TrophyRRNH0–2WTA 1000Dubai / Qatar OpenAAQF2R2R1R1R2R2RAA6–7Indian Wells OpenAAA1RNHQF2R1R2R1RA4–6Miami OpenAAA1RNHA2RA1RAA1–3Madrid OpenAAA1RNH1R1RQF1RA1R2–6Italian OpenAAA1R2R1R2R2R1R1RA3–7Canadian OpenAA2R2RNH1R1R1R2RA3–6Cincinnati OpenAAAA1R1R1RA1RA0–4Wuhan OpenA2R1RSFNH1RA4–4China Open1R1R1R1RNH1RA0–5Career statisticsTitles10100130Total: 6Year-end ranking62462064664739495360$1,015,939

Grand Slam tournament finals Doubles: 1 (runner-up) ResultYearTournamentSurfacePartnerOpponentsScoreLoss 2018 French Open Clay Eri Hozumi Barbora Krejčíková Kateřina Siniaková 3–6, 3–6

WTA Tour finals Doubles: 19 (9 titles, 10 runner-ups) LegendGrand Slam (0–1)WTA 500 (1–0)WTA 250 (8–9)Finals by surfaceHard (5–7)Grass (2–0)Clay (2–3) ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreLoss 0–1 Aug 2016 Jiangxi International, China International Hard Shuko Aoyama Liang Chen<br/ > Lu Jingjing 6–3, 6–7(2), [11–13]Win 1–1 Sep 2016 Japan Women's Open, Japan International Hard Shuko Aoyama Jocelyn Rae Anna Smith 6–3, 6–3Loss 1–2 Mar 2017 Malaysian Open, Malaysia International Hard Nicole Melichar Ashleigh Barty Casey Dellacqua 6–7(5), 3–6Loss 1–3 Jan 2018 Hobart International, Australia International Hard Lyudmyla Kichenok Elise Mertens Demi Schuurs 2–6, 2–6Loss 1–4 Jun 2018French Open, FranceGrand Slam Clay Eri Hozumi Barbora Krejčíková Kateřina Siniaková 3–6, 3–6Loss 1–5 Sep 2018 Japan Women's Open International Hard Miyu Kato Eri Hozumi Zhang Shuai 2–6, 4–6Win 2–5 Sep 2018Pan Pacific Open, JapanPremier Hard (i) Miyu Kato Andrea Sestini Hlaváčková Barbora Strýcová 6–4, 6–4Loss 2–6 Apr 2021 İstanbul Cup, Turkey WTA 250 Clay Nao Hibino Veronika Kudermetova Elise Mertens 1–6, 1–6Loss 2–7 May 2021 Internationaux de Strasbourg, France WTA 250 Clay Yang Zhaoxuan Alexa Guarachi Desirae Krawczyk 2–6, 3–6Win 3–7 Jun 2021 Nottingham Open, United Kingdom WTA 250 Grass Lyudmyla Kichenok Caroline Dolehide Storm Sanders 6–4, 6–7(3), [10–8]Loss 3–8 Aug 2021 Chicago Open, United States WTA 250 Hard Lyudmyla Kichenok Nadiia Kichenok Raluca Olaru 6–7(6), 7–5, [8–10]Win 4–8 Jan 2022 Adelaide International, Australia WTA 250 Hard Eri Hozumi Tereza Martincová Markéta Vondroušová 1–6, 7–6(4), [10–7]Win 5–8 Rabat Grand Prix, Morocco WTA 250 Clay Eri Hozumi Monica Niculescu Alexandra Panova 6–7(7), 6–3, [10–8]Win 6–8 Bad Homburg Open, Germany WTA 250 Grass Eri Hozumi Alicja Rosolska Erin Routliffe 6–4, 6–7(5), [10–5]Loss 6–9 Guangzhou Open, China WTA 250 Hard Eri Hozumi Guo Hanyu Jiang Xinyu 3–6, 6–7(4)Loss 6–10 Jiangxi Open, China WTA 250 Hard Eri Hozumi Laura Siegemund Vera Zvonareva 4–6, 2–6Win7–10Hong Kong Open, China SARWTA 250Hard Ulrikke Eikeri Shuko Aoyama Eri Hozumi6–4, 4–6, [11–9]Win8–10Hamburg Open, GermanyWTA 250Clay Nadiia Kichenok Anna Bondár Arantxa Rus6–4, 3–6, [11–9]Win9–10Jul 2025Prague Open, Czech RepublicWTA 250Hard Nadiia Kichenok Laura Samson Lucie Havlíčková1–6, 6–4, [10–7]

WTA 125 finals Doubles: 6 (2 titles, 4 runner-ups) ResultW–LDateTournamentSurfacePartnerOpponentsScoreWin1–0Open de Saint-Malo, FranceClay Eri Hozumi Estelle Cascino Jessika Ponchet7–6(1), 6–1Loss1–1Oct 2024 Hong Kong 125 Open, China SARClay Nao Hibino Monica Niculescu Elena-Gabriela Ruse3–6, 7–5, [5–10]Win2–1Open de Saint-Malo, France (2)Clay Maia Lumsden Oksana Kalashnikova Angelica Moratelli7–5, 6–2Loss2–2Suzhou Ladies Open, ChinaHard Katarzyna Kawa Aldila Sutjiadi Janice Tjen4–6, 3–6Loss2–3 Feb 2026Oeiras Indoors, Portugal Hard (i) Emily Appleton Carmen Corley Ivana Corley 6–2, 0–6, [4–10]Loss2–4İstanbul Open, TurkeyClay Anastasia Dețiuc Maria Kozyreva Laura Pigossi4–6, 6–4, [7–10]

ITF Circuit finals Singles: 3 (1 title, 2 runner-ups) Legend$25,000 tournaments (0–1)$10,000 tournaments (1–1)Finals by surfaceHard (0–1)Grass (1–1) ResultW–LDateTournamentTierSurfaceOpponentScoreWin 1–0 Mar 2012ITF Miyazaki, Japan10,000 Grass Yumi Miyazaki 6–0, 6–7(5), 6–0Loss 1–1 May 2015ITF Karuizawa, Japan25,000 Grass Miyu Kato 6–7(5), 7–5, 1–6Loss 1–2 Aug 2015ITF Gimcheon, South Korea10,000 Hard Lee So-ra 2–6, 3–6

Doubles: 33 (21 titles, 12 runner-ups) Legend$100,000 tournaments (2–0)$75,000 tournaments (2–1)$50/60,000 tournaments (6–2)$25,000 tournaments (6–5)$10,000 tournaments (5–4)Finals by surfaceHard (15–7)Clay (0–1)Grass (4–2)Carpet (2–2) ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreWin 1–0 Nov 2011 Toyota World Challenge, Japan 75,000 Carpet (i) Riko Sawayanagi Caroline Garcia Michaëlla Krajicek w/oLoss 1–1 Mar 2013 ITF Nishitama, Japan 10,000 Hard Eri Hozumi Han Na-lae Kang Seo-kyung 4–6, 7–6(4), [6–10]Win 2–1 Jun 2013 ITF Bukhara, Uzbekistan 25,000 Hard Eri Hozumi Angelina Gabueva Veronika Kapshay 3–6, 7–5, [10–8]Win 3–1 Jun 2013 ITF Tokyo, Japan 10,000 Hard Yuka Mori Kumiko Iijima Akiko Yonemura 6–4, 6–3Win 4–1 Sep 2013 ITF Noto, Japan 25,000 Grass Eri Hozumi Kazusa Ito Yuka Mori 6–4, 6–4Win 5–1 Oct 2013 ITF Makinohara, Japan 25,000 Grass Eri Hozumi Nicha Lertpitaksinchai Peangtarn Plipuech 6–1, 6–2Loss 5–2 Nov 2013 Toyota World Challenge, Japan 75,000 Carpet (i) Eri Hozumi Shuko Aoyama Misaki Doi 6–7(1), 6–2, [9–11]Win 6–2 Jun 2014 ITF Tokyo, Japan 10,000 Hard Mana Ayukawa Yurina Koshino Akiko Omae 3–6, 6–4, [10–4]Loss 6–3 Jun 2014 ITF Kashiwa, Japan 10,000 Hard Yuuki Tanaka Yuki Chiang Aki Yamasoto 7–5, 1–6, [5–10]Loss 6–4 Jun 2014 ITF Gimcheon, Korea 10,000 Hard Choi Ji-hee Kim So-jung Lee Ye-ra 5–7, 6–2, [9–11]Win 7–4 Jun 2014 ITF Gimcheon, Korea 10,000 Hard Choi Ji-hee Han Na-lae Yoo Mi 6–3, 7–6(6)Loss 7–5 Jul 2014 ITF Wuhan, China 50,000 Hard Miyu Kato Han Xinyun Zhang Kailin 4–6, 2–6Win 8–5 Sep 2014 ITF Kyoto, Japan 10,000 Hard (i) Kyōka Okamura Ayaka Okuno Michika Ozeki 6–3, 6–3Loss 8–6 Oct 2014 ITF Makinohara, Japan 25,000 Grass Mari Tanaka Tatjana Maria Miki Miyamura 3–6, 1–6Loss 8–7 Oct 2014 ITF Hamamatsu, Japan 25,000 Carpet Mari Tanaka Tatjana Maria Miki Miyamura 7–5, 2–6, [5–10]Win 9–7 Nov 2014 Toyota World Challenge, Japan 75,000 Carpet (i) Eri Hozumi Shuko Aoyama Junri Namigata 6–3, 7–5Win 10–7 Jan 2015 ITF Hong Kong, China SAR 10,000 Hard Mana Ayukawa Tang Haochen Ye Qiuyu 7–6, 2–6, [10–7]Win 11–7 Mar 2015 Blossom Cup, China 50,000 Hard Eri Hozumi Hiroko Kuwata Junri Namigata 6–3, 6–7(2), [10–2]Win 12–7 May 2015 Kurume Cup, Japan 50,000 Grass Riko Sawayanagi Eri Hozumi Junri Namigata 7–6(10), 6–3Loss 12–8 May 2015 ITF Karuizawa, Japan 25,000 Grass Mana Ayukawa Rika Fujiwara Miyu Kato 2–6, 0–6Loss 12–9 May 2015 ITF Changwon, South Korea 25,000 Hard (i) Mana Ayukawa Han Na-lae Yoo Mi 3–6, 1–6Loss 12–10 Jun 2015 ITF Kashiwa, Japan 25,000 Hard Mana Ayukawa Miyu Kato Akiko Omae 2–6, 7–5, [8–10]Loss 12–11 Aug 2015 ITF Gimcheon, South Korea 10,000 Hard Han Sung-hee Cao Siqi Xun Fangying 6–7(2), 4–6Win 13–11 Aug 2015 ITF Tsukuba, Japan 25,000 Hard Lee Ya-hsuan Nicha Lertpitaksinchai Peangtarn Plipuech 7–6(4), 6–7(2), [6–10]Win 14–11 Oct 2015 ITF Hamamatsu, Japan 25,000 Grass Mana Ayukawa Kanae Hisami Kotomi Takahata 0–6, 6–3, [10–4]Win 15–11 Nov 2015 ITF Tokyo Open, Japan 100,000 Hard Shuko Aoyama Eri Hozumi Kurumi Nara 3–6, 6–2, [10–7]Win 16–11 Mar 2016 Blossom Cup, China 50,000 Hard Shuko Aoyama Lu Jingjing Zhang Yuxuan 6–3, 6–0Win 17–11 Apr 2016 Pingshan Open, China 50,000 Hard Shuko Aoyama Liang Chen Wang Yafan 7–6(5), 6–4Win 18–11 May 2016 ITF Incheon, South Korea 25,000 Hard Han Sung-hee Kamonwan Buayam Lee Pei-chi 6–3, 6–1Win 19–11 Jul 2016 ITF Wuhan, China 50,000 Hard Shuko Aoyama Chang Kai-chen Duan Yingying 6–4, 6–4Win 20–11 Oct 2017 Liuzhou Open China 60,000 Hard Han Xinyun Jacqueline Cako Laura Robson 6–2, 7–6(3)Loss Mar 2018Clay Court International, Australia60,000 Clay Miyu Kato Priscilla Hon Dalila Jakupović 4–6, 6–4, [7–10]Win 21–12 Nov 2019Shenzhen Longhua Open, China100,000 Hard Nao Hibino Sofia Shapatava Emily Webley-Smith 6–4, 6–0

Notes

References

External links