She achieved a career-high singles ranking of No. 280 and peaked at No. 20 in the WTA rankings on 22 October 2018. Partnering with Eri Hozumi she reached the final of the 2018 French Open.

In doubles, she has won six titles on the WTA Tour, one title on the WTA Challenger Tour as well as 21 ITF titles. In singles, she has won one ITF title.

Playing for Japan Fed Cup team, she has a win–loss record of 5–1.

Career

Ninomiya began playing tennis on ITF events in 2009.

She reached her biggest final at the 2018 French Open with partner Eri Hozumi. Ninomiya also reached the final of the 2023 Jiangxi Open partnering with Eri Hozumi.

Performance timeline

**Key**
W	F	SF	QF	#R	RR	Q#	P#	DNQ	A	Z#	PO	G	S	B	NMS	NTI	P	NH

(W) winner; (F) finalist; (SF) semifinalist; (QF) quarterfinalist; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage; (Q#) qualification round; (P#) preliminary round; (DNQ) did not qualify; (A) absent; (Z#) Davis/Fed Cup Zonal Group (with number indication) or (PO) play-off; (G) gold, (S) silver or (B) bronze Olympic/Paralympic medal; (NMS) not a Masters tournament; (NTI) not a Tier I tournament; (P) postponed; (NH) not held; (SR) strike rate (events won / competed); (W–L) win–loss record.

To avoid confusion and double counting, these charts are updated at the conclusion of a tournament or when the player's participation has ended.

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.

Doubles

Tournament	2016	2017	2018	2019	2020	2021	2022	2023	W–L	Win %
Grand Slam tournaments
Australian Open	1R	1R	1R	1R	2R	1R	2R	2R	3–8	27%
French Open	A	A	F	1R	1R	2R	1R	1R	6–6	50%
Wimbledon	2R	SF	1R	2R	NH	2R	A	1R	7–6	54%
US Open	1R	1R	1R	1R	1R	1R	1R	1R	0–8	0%
Win–loss	1–3	4–3	5–4	1–4	1–3	2–4	1–3	1–4	16–29	36%
Year-end championships
WTA Elite Trophy			RR		NH				0–2	0%
WTA 1000
Dubai / Qatar Open^[a]	A	A	QF	2R	2R	1R	1R	2R	5–6	45%
Indian Wells Open	A	A	A	1R	NH	QF	2R		3–3	50%
Miami Open	A	A	A	1R	NH	A	2R		1–2	33%
Madrid Open	A	A	A	1R	NH	1R	1R		0–3	0%
Italian Open	A	A	A	1R	2R	1R	2R		2–4	33%
Canadian Open	A	A	2R	2R	NH	1R	1R		2–4	33%
Cincinnati Open	A	A	A	A	1R	1R	1R		0–3	0%
Wuhan Open	A	2R	1R	SF	NH				4–3	57%
China Open	1R	1R	1R	1R	NH				0–4	0%
WTA career statistics
Titles	1	0	1	0	0	1	3	0	Total: 6
Year-end ranking^[b]	62	46	20	64	66	47	39		$1,015,939

Grand Slam tournament finals

Doubles: 1 (runner-up)

Result	Year	Tournament	Surface	Partner	Opponents	Score
Loss	2018	French Open	Clay	Eri Hozumi	Barbora Krejčíková Kateřina Siniaková	3–6, 3–6

WTA career finals

Doubles: 16 (6 titles, 10 runner-ups)

Legend
Grand Slam (0–1)
WTA 1000
WTA 500 (1–0)
WTA 250 (5–9)

Finals by surface
Hard (3–7)
Grass (2–0)
Clay (1–3)
Carpet (0–0)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Aug 2016	Jiangxi Open, China	International^[c]	Hard	Shuko Aoyama	Liang Chen 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, 6–3
Loss	1–2	Mar 2017	Malaysian Open, Malaysia	International	Hard	Nicole Melichar	Ashleigh Barty Casey Dellacqua	6–7⁽⁵⁾, 3–6
Loss	1–3	Jan 2018	Hobart International, Australia	International	Hard	Lyudmyla Kichenok	Elise Mertens Demi Schuurs	2–6, 2–6
Loss	1–4	Jun 2018	French Open, France	Grand Slam	Clay	Eri Hozumi	Barbora Krejčíková Kateřina Siniaková	3–6, 3–6
Loss	1–5	Sep 2018	Japan Women's Open, Japan	International	Hard	Miyu Kato	Eri Hozumi Zhang Shuai	2–6, 4–6
Win	2–5	Sep 2018	Pan Pacific Open, Japan	Premier^[d]	Hard (i)	Miyu Kato	Andrea Sestini Hlaváčková Barbora Strýcová	6–4, 6–4
Loss	2–6	Apr 2021	İstanbul Cup, Turkey	WTA 250	Clay	Nao Hibino	Veronika Kudermetova Elise Mertens	1–6, 1–6
Loss	2–7	May 2021	Internationaux de Strasbourg, France	WTA 250	Clay	Yang Zhaoxuan	Alexa Guarachi Desirae Krawczyk	2–6, 3–6
Win	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	May 2022	Grand Prix Lalla Meryem, Morocco	WTA 250	Clay	Eri Hozumi	Monica Niculescu Alexandra Panova	6–7⁽⁷⁾, 6–3, [10–8]
Win	6–8	Jun 2022	Bad Homburg Open, Germany	WTA 250	Grass	Eri Hozumi	Alicja Rosolska Erin Routliffe	6–4, 6–7⁽⁵⁾, [10–5]
Loss	6–9	Sep 2023	Guangzhou Open, China	WTA 250	Hard	Eri Hozumi	Guo Hanyu Jiang Xinyu	3–6, 6–7^(4–7)
Loss	6–10	Oct 2023	Jiangxi Open, China	WTA 250	Hard	Eri Hozumi	Laura Siegemund Vera Zvonareva	4–6, 2–6

WTA Challenger finals

Doubles: 1 (title)

Result	W–L	Date	Tournament	Surface	Partner	Opponents	Score
Win	1–0	May 2022	Open de Saint-Malo, France	Clay	Eri Hozumi	Estelle Cascino Jessika Ponchet	7–6^(7–1), 6–1

ITF Circuit finals

Singles: 3 (1 title, 2 runner–ups)

Legend
$25,000 tournaments (0–1)
$10,000 tournaments (1–1)

Finals by surface
Hard (0–1)
Grass (1–1)

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Win	1–0	Mar 2012	ITF Miyazaki, Japan	10,000	Grass	Yumi Miyazaki	6–0, 6–7⁽⁵⁾, 6–0
Loss	1–1	May 2015	ITF Karuizawa, Japan	25,000	Grass	Miyu Kato	6–7⁽⁵⁾, 7–5, 1–6
Loss	1–2	Aug 2015	ITF Gimcheon, South Korea	10,000	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 surface
Hard (16–7)
Clay (0–1)
Grass (3–2)
Carpet (2–2)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Nov 2011	Toyota World Challenge, Japan	75,000	Carpet (i)	Riko Sawayanagi	Caroline Garcia Michaëlla Krajicek	w/o
Loss	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, 6–3
Win	4–1	Sep 2013	ITF Noto, Japan	25,000	Grass	Eri Hozumi	Kazusa Ito Yuka Mori	6–4, 6–4
Win	5–1	Oct 2013	ITF Makinohara, Japan	25,000	Grass	Eri Hozumi	Nicha Lertpitaksinchai Peangtarn Plipuech	6–1, 6–2
Loss	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, 2–6
Win	8–5	Sep 2014	ITF Kyoto, Japan	10,000	Hard (i)	Kyōka Okamura	Ayaka Okuno Michika Ozeki	6–3, 6–3
Loss	8–6	Oct 2014	ITF Makinohara, Japan	25,000	Grass	Mari Tanaka	Tatjana Maria Miki Miyamura	3–6, 1–6
Loss	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, 7–5
Win	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	Hard	Riko Sawayanagi	Eri Hozumi Junri Namigata	7–6⁽¹⁰⁾, 6–3
Loss	12–8	May 2015	ITF Karuizawa, Japan	25,000	Grass	Mana Ayukawa	Rika Fujiwara Miyu Kato	2–6, 0–6
Loss	12–9	May 2015	ITF Changwon, South Korea	25,000	Hard (i)	Mana Ayukawa	Han Na-lae Yoo Mi	3–6, 1–6
Loss	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⁾, 4–6
Win	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, 6–0
Win	17–11	Apr 2016	ITF Shenzhen, China	50,000	Hard	Shuko Aoyama	Liang Chen Wang Yafan	7–6⁽⁵⁾, 6–4
Win	18–11	May 2016	ITF Incheon, South Korea	25,000	Hard	Han Sung-hee	Kamonwan Buayam Lee Pei-chi	6–3, 6–1
Win	19–11	Jul 2016	ITF Wuhan, China	50,000	Hard	Shuko Aoyama	Chang Kai-chen Duan Yingying	6–4, 6–4
Win	20–11	Oct 2017	Liuzhou Open China	60,000	Hard	Han Xinyun	Jacqueline Cako Laura Robson	6–2, 7–6⁽³⁾
Loss	20–12	Mar 2018	Clay Court International, Australia	60,000	Clay	Miyu Kato	Priscilla Hon Dalila Jakupović	4–6, 6–4, [7–10]
Win	21–12	Nov 2019	Shenzhen Longhua Open, China	100,000	Hard	Nao Hibino	Sofia Shapatava Emily Webley-Smith	6–4, 6–0

Notes

References

External links

Women's Tennis Association: Top Japanese female doubles tennis players

Women's Tennis Association: Top Japanese female doubles tennis players
as of 29 January 2024
1. Shuko Aoyama (18) 2. Ena Shibahara (22) 3. Miyu Kato (28) 4. Eri Hozumi (42)
5. Makoto Ninomiya (48) 6. Mai Hontama (119) 7. Nao Hibino (148) 8. Moyuka Uchijima (196)
9. Ayano Shimizu (212) 10. Momoko Kobori (213)