is a Japanese tennis player. Her career-high WTA singles ranking is 105, which she reached in February 2011. Her career-high doubles ranking is 101, achieved May 2015.

Early life and amateur career Namigata was born in Koshigaya, Saitama Prefecture and started playing tennis when she was six years old. She completed elementary school at a school in Koshigaya and won a regional tournament when in the third grade. She attended Fujimura Girls' Junior High School and Horikoshi High School in Tokyo. In September 1997, when still in junior high school, she made her first appearance in an ITF doubles tournament. In her first year of high school, she reached the round of 16 at the All Japan Tennis Championship and won the All Japan Junior Championship title in her final year of high school. She enrolled in the School of Social Sciences at Waseda University and in 2001 won the intercollegiate doubles title, was runner-up in the singles title, and was a member of the Waseda team that took out the team event. In 2004, she won the intercollegiate singles title and also won her first ITF doubles titles in October.

Professional career Namigata turned professional in August 2005, after graduating from Waseda in April of the same year. Her goal was to finish her first year as a professional ranked in the top 200; she finished 2006 ranked 162 in singles. The first of her six singles titles came in July 2007.

In July 2014, Namigata won her first WTA event, the doubles tournament of the inaugural Jiangxi International Open, partnering with Chuang Chia-jung. 2014 was the most successful year of her career thus far, winning three doubles titles and her first singles title on the ITF Circuit since 2010. She finished the year ranked 196 in singles and 145 in doubles, returning to the top 200 in each category for the first time since 2011.

Grand Slam appearances In singles, Namigata has qualified for two major tournaments. At the 2011 Australian Open, she lost to Canadian Rebecca Marino in the first round. Later in the year, at the French Open, she lost in the first round to Aleksandra Wozniak.

In doubles, she qualified for the 2008 Wimbledon Championships with fellow Japanese player Ayumi Morita, losing in the first round to Ekaterina Makarova and Selima Sfar.

In 2017, Namigata and Chan Chin-wei received wildcard entry into the Australian Open, losing in the first round to Tatjana Maria and Pauline Parmentier.

Fed Cup Namigata represented Japan in the Asia/Oceania group of the 2011 Fed Cup.

WTA Tour finals Doubles: 1 (runner–up) LegendGrand SlamWTA 1000WTA 500WTA 250 (0–1) ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreLoss 0–1 Bangkok Open, Thailand Tier III Hard Ayumi Morita Sun Tiantian Yan Zi w/o

WTA Challenger finals Doubles: 1 (title) ResultW–LDateTournamentSurfacePartnerOpponentsScoreWin 1–0 Jiangxi International, China Hard Chuang Chia-jung Chan Chin-wei Xu Yifan 7–6(7–4), 6–3

ITF Circuit finals Singles: 23 (7 titles, 16 runner–ups) Legend$75,000 tournaments$50,000 tournaments$25,000 tournaments$10,000 tournaments ResultW–LDateTournamentTierSurfaceOpponentScoreLoss 0–1 Jul 2004ITF Inchon, South Korea10,000 Hard Lee Eun-jeong 0–6, 6–3, 0–6Loss 0–2 May 2006ITF Ho Chi Minh City, Vietnam25,000 Hard Katarína Kachlíková 4–6, 4–6Win 1–2 Jul 2007ITF Miyazaki, Japan25,000 Carpet Zhang Shuai 6–4, 6–2Loss 1–3 Oct 2007ITF Hamanako, Japan25,000 Carpet Yanina Wickmayer 6–4, 4–6, 2–6Loss 1–4 Apr 2009ITF Changwon, South Korea25,000 Hard Elena Baltacha 3–6, 1–6Win 2–4 May 2009ITF Gunma, Japan25,000 Carpet Hsu Wen-hsin 6–1, 6–1Win 3–4 Jul 2009ITF Miyazaki, Japan10,000 Carpet Shiho Akita 7–6(6), 6–2Loss 3–5 Aug 2009ITF Obihiro, Japan25,000 Carpet Kurumi Nara 6–7(4), 6–4, 4–6Win 4–5 May 2010Fukuoka International, Japan50,000 Grass Nikola Hofmanova 6–1, 6–2Loss 4–6 May 2010ITF Kusatsu, Japan25,000 Carpet Akiko Yonemura 4–6, 6–7(4)Win 5–6 Aug 2010Beijing Challenger, China75,000 Hard Zhang Shuai 7–6(3), 6–2Loss 5–6 Nov 2010Toyota World Challenge, Japan75,000 Carpet (i) Misaki Doi 7–5, 6–2Loss 5–8 Oct 2011ITF Hamanako, Japan25,000 Carpet Karolína Plíšková 2–6, 6–7(4)Loss 5–9 May 2012ITF Karuizawa, Japan25,000 Grass Marta Sirotkina 4–6, 6–2, 4–6Loss 5–10 May 2013ITF Karuizawa, Japan25,000 Grass Eri Hozumi 6–7(5), 3–6Loss 5–11 Jun 2014ITF Changwon, South Korea25,000 Hard Hong Hyun-hui 6–2, 4–6, 3–6Loss 5–12 Jun 2014ITF Kashiwa, Japan10,000 Hard Riko Sawayanagi 4–6, 6–7(5)Win 6–12 Aug 2014ITF Tsukuba, Japan25,000 Hard Chang Kai-chen 6–0, 7–6(3)Loss 6–13 Oct 2014ITF Hamamatsu, Japan25,000 Carpet Riko Sawayanagi 6–2, 2–6, 3–6Loss 6–14 May 2017ITF Karuizawa, Japan25,000 Carpet Ayano Shimizu 6–0, 4–6, 4–6Loss 6–15 Sep 2017ITF Nanao, Japan25,000 Carpet Carol Zhao 3–6, 2–6Loss 6–16 Oct 2018ITF Makinohara, Japan25,000 Carpet Momoko Kobori 2–6, 3–6Win 7–16 Sep 2019ITF Nanao, Japan25,000 Carpet Ayano Shimizu 7–6(5), 4–6, 6–2

Doubles: 52 (25 titles, 27 runner–ups) Legend$100,000 tournaments$75/80,000 tournaments$50/60,000 tournaments$25,000 tournaments$10/15,000 tournaments ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreWin 1–0 Oct 2004ITF Tokyo, Japan10,000 Hard Kumiko Iijima Maki Arai Akiko Yonemura 6–3, 6–1Win 2–0 Jul 2005ITF Hamilton, Canada25,000 Clay Kumiko Iijima Lauren Barnikow Lauren Breadmore 6–7(4), 6–2, 6–2Loss 2–1 Jul 2005Lexington Challenger, United States50,000 Hard Kumiko Iijima Vilmarie Castellvi Samantha Reeves 2–6, 1–6Loss 2–2 Feb 2006ITF Sydney, Australia25,000 Hard Ayumi Morita Chan Yung-jan Chuang Chia-jung 2–6, 1–6Win 3–2 May 2006ITF Nagano, Japan25,000 Carpet Kumiko Iijima Remi Tezuka Tomoko Yonemura 6–3, 7–6(3)Win 4–2 Aug 2006ITF Tokachi, Japan25,000 Carpet Kumiko Iijima Shiho Hisamatsu Remi Tezuka 7–5, 6–4Win 5–2 Sep 2006ITF Ibaraki, Japan25,000 Hard Kumiko Iijima Natsumi Hamamura Ayaka Maekawa 6–7(4), 6–3, 6–2Loss 5–3 Apr 2007ITF Jackson, United States25,000 Clay Yurika Sema Eva Hrdinová Michaela Paštíková 6–7(5), 6–7(3)Loss 5–4 May 2007Fukuoka International, Japan50,000 Carpet Rika Fujiwara Ayumi Morita Akiko Yonemura 2–6, 2–6Win 6–4 Jul 2007ITF Nagoya, Japan25,000 Hard Akiko Yonemura Chang Kyung-mi Kim Jin-hee 6–2, 3–6, 6–4Win 7–4 Aug 2007ITF Obihiro, Japan25,000 Carpet Kumiko Iijima Ayumi Morita Akiko Yonemura 7–6(3), 6–0Win 8–4 Sep 2007ITF Tokyo, Japan50,000 Hard Rika Fujiwara Kumiko Iijima Akiko Yonemura 3–6, 7–6(4), [10–5]Loss 8–5 Aug 2008Vancouver Open, Canada50,000 Hard Christina Fusano Carly Gullickson Nicole Kriz 7–6(4), 1–6, [5–10]Win 9–5 Oct 2008ITF Makinohara, Japan25,000 Carpet Natsumi Hamamura Chae Kyung-yee Han Xinyun 7–5, 7–6(4)Loss 9–6 Oct 2008ITF Hamanako, Japan25,000 Carpet Akiko Yonemura Kanae Hisami Yurina Koshino 5–7, 4–6Loss 9–7 May 2009Fukuoka International, Japan50,000 Grass Ayaka Maekawa Akiko Yonemura Tomoko Yonemura 2–6, 7–6(3), [3–10]Win 10–7 May 2009ITF Nagano, Japan25,000 Carpet Akiko Yonemura Tomoyo Takagishi Varatchaya Wongteanchai 6–1, 6–4Loss 10–8 Apr 2010ITF Incheon, South Korea25,000 Hard Misaki Doi Irina-Camelia Begu Erika Sema 0–6, 6–7(8)Loss 10–9 Apr 2010ITF Gimhae, South Korea25,000 Hard Misaki Doi Chang Kyung-mi Lee Jin-a 6–1, 4–6, [8–10]Loss 10–10 Apr 2010ITF Changwon, South Korea25,000 Hard Misaki Doi Chang Kyung-mi Lee Jin-a 7–5, 3–6, [8–10]Loss 10–11 May 2011 Fukuoka International, Japan50,000 Grass Aiko Nakamura Shuko Aoyama Rika Fujiwara 6–7(3), 0–6Loss 10–12 Oct 2011ITF Makinohara, Japan25,000 Carpet Akiko Yonemura Shuko Aoyama Kotomi Takahata 2–6, 5–7Loss 10–13 Mar 2012ITF Ipswich, Australia25,000 Clay Shuko Aoyama Monique Adamczak Sandra Zaniewska 5–7, 4–6Win 11–13 Apr 2012ITF Bundaberg, Australia25,000 Clay Shuko Aoyama Sacha Jones Sally Peers 6–1, 7–5Win 12–13 Jul 2012ITF Middelburg, Netherlands25,000 Clay Yurika Sema Bernice van de Velde Angelique van der Meet 6–3, 6–1Loss 12–14 Apr 2013ITF Wenshan, China50,000 Hard Rika Fujiwara Miki Miyamura Varatchaya Wongteanchai 5–7, 3–6Win 13–14 May 2013Fukuoka International, Japan50,000 Grass Erika Sema Rika Fujiwara Akiko Omae 7–5, 3–6, [10–7]Win 14–14 Oct 2013ITF Hamamatsu, Japan25,000 Grass Shuko Aoyama Belinda Bencic Sofia Shapatava 6–4, 6–3Win 15–14 Mar 2014ITF Nishitama, Japan10,000 Hard Akiko Yonemura Choi Ji-hee Akari Inoue 6–2, 6–4Loss 15–15 May 2014Kurume Cup, Japan50,000 Grass Akiko Yonemura Jarmila Gajdošová Arina Rodionova 4–6, 2–6Win 16–15 May 2014ITF Karuizawa, Japan25,000 Grass Akiko Yonemura Kanae Hisami Chiaki Okadaue 6–2, 7–5Win 17–15 May 2014ITF Changwon, Korea25,000 Hard Chuang Chia-jung Lee Ye-ra Kim So-jung 7–6(5), 6–0Loss 17–16 Nov 2014Toyota World Challenge, Japan75,000 Carpet (i) Shuko Aoyama Eri Hozumi Makoto Ninomiya 3–6, 5–7Loss 17–17 Feb 2015Burnie International, Australia50,000 Hard Han Xinyun Irina Falconi Petra Martić 2–6, 4–6Win 18–17 Feb 2015Launceston International, Australia50,000 Hard Han Xinyun Wang Yafan Yang Zhaoxuan 6–4, 3–6, [10–6]Loss 18–18 Mar 2015Blossom Cup, China50,000 Hard Hiroko Kuwata Eri Hozumi Makoto Ninomiya 3–6, 7–6(2), [2–10]Loss 18–19 May 2015Fukuoka International, Japan50,000 Grass Eri Hozumi Naomi Broady Kristýna Plíšková 3–6, 4–6Loss 18–20 May 2015Kurume Cup, Japan50,000 Grass Eri Hozumi Makoto Ninomiya Riko Sawayanagi 6–7(10), 3–6Win 19–20 Feb 2017ITF Perth, Australia25,000 Hard Riko Sawayanagi Irina Bara Prarthana Thombare 7–6(5), 4–6, [11–9]Win 20–20 Feb 2017ITF Perth, Australia25,000 Hard Riko Sawayanagi Tammi Patterson Olivia Rogowska 4–6, 7–5, [10–6]Win 21–20 May 2017Fukuoka International, Japan60,000 Carpet Kotomi Takahata Erina Hayashi Robu Kajitani 6–0, 6–7(3), [10–7]Loss 21–21 Nov 2017ITF Tokyo Open, Japan 100,000 Hard Eri Hozumi Yuki Naito Rika Fujiwara 1–6, 3–6Win 22–21 Nov 2017Toyota World Challenge, Japan60,000 Carpet (i) Ksenia Lykina Nicha Lertpitaksinchai Peangtarn Plipuech 3–6, 6–3, [10–4]Loss 22–22 Jan 2018Playford International, Australia25,000 Hard Erika Sema Dalila Jakupović Irina Khromacheva 6–2, 5–7, [5–10]Loss 22–23 June 2018ITF Singapore25,000 Hard Miyabi Inoue Zoe Hives Olivia Tjandramulia 4–6, 6–4, [6–10]Win 23–23 Jun 2019ITF Hong Kong25,000 Hard Abigail Tere-Apisah Erina Hayashi Momoko Kobori 6–3, 2–6, [10–6]Win 24–23 Jun 2019ITF Jakarta, Indonesia 25,000 Hard Haruka Kaji Beatrice Gumulya Jessy Rompies 6–2, 4–6, [10–7]Win 25–23 Jul 2019Challenger de Granby, Canada80,000 Hard Haruka Kaji Quinn Gleason Ingrid Neel 7–6(5), 5–7, [10–8]Loss 25–24 Nov 2019ITF Tokyo Open, Japan100,000 Hard Haruka Kaji Choi Ji-hee Han Na-lae 3–6, 3–6Loss 25–25 Sep 2022ITF Yeongwol, South Korea15,000 Hard Riko Sawayanagi Back Da-yeon Lee Eun-hye 5–7, 6–3, [11–13]Loss 25–26 Nov 2022ITF Tokyo Open, Japan60,000 Hard (i) Mai Hontama Hsieh Yu-chieh Jessy Rompies 4–6, 3–6Loss 25–27 May 2023Kurume Cup, Japan60,000 Grass Funa Kozaki Talia Gibson Wang Yafan 3–6, 3–6

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