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born 29 April 1991 is a Japanese former professional tennis player. Her highest WTA rankings are No. 30 in singles and No. 77 in doubles.
Doi reached two junior Grand Slam doubles finals – at Wimbledon in 2007 with Kurumi Nara, and at the Australian Open in 2008, with Elena Bogdan (losing both). She has made it to three WTA tournament finals (only winning one). She is managed by Muse Group, a sports marketing agency based in Tokyo.
A highlight of Doi's junior career was her successful doubles partnership with age-mate Kurumi Nara. They placed second in girls' doubles at the 2007 Wimbledon Championships, becoming only the second Japanese pair to reach the finals of a Grand Slam juniors event since Yuka Yoshida and Hiroko Mochizuki at the 1993 US Open. Doi and Nara continued their run by advancing to the girls' doubles semifinals at a number of high-profile tournaments, such as the 2007 US Open and Wimbledon 2008. Doi also teamed with Romanian Elena Bogdan to place second in girls' doubles at the 2008 Australian Open. This flurry of successes catapulted Doi to No. 3 in Japan's under-18 tennis rankings for 2007; she had been recognized early on as one of Japan's rising stars in junior tennis.
2008 marked Doi's first participation in ITF Women's Circuit events. She partnered with Kurumi Nara again for the 2008 ITF event in Miyazaki, where they upset top-seeded sisters Erika Sema and Yurika Sema, 3–6, 6–3, 10–6 in the second round. Doi and Nara went on to triumph over Kimiko Date-Krumm and Tomoko Yonemura in the final.
Her success continued in the qualifying rounds of the French Open, where she defeated Mandy Minella and upset Michelle Larcher de Brito to reach the qualifier finals. With her victory over Vitalia Diatchenko, Doi had earned a spot in her first major tournament main draw, where she lost to Polona Hercog in the first round. She finished the year with a first-place performance in the All Japan Tennis Championships women's singles.
After failing to qualify for the main draws of the US Open and Pan Pacific Open, Doi found success at the Japan Women's Open, where she defeated Chanelle Scheepers in three sets to reach her first tour semifinal.
Doi competed at the Birmingham Classic, losing to Johanna Konta. She then reached the last 16 of Wimbledon, beating Louisa Chirico, Karolína Plíšková and Anna-Lena Friedsam before losing to Kerber, in straight sets. Doi was the first Japanese player to reach the fourth round of the ladies draw since Ai Sugiyama ten years earlier.
She made her top 30 debut on 10 October 2016.
She had a minor resurgence on clay, beating WR13 and ninth seed Madison Keys and qualifier Donna Vekic at the Mutua Madrid Open, and then reaching the semifinals at Nürnberg. She then suffered a disappointing first-round exit at the French Open to Sara Errani, before exiting at the same stage at Wimbledon to Kirsten Flipkens.
For the rest of the year, Doi was not able to win back-to-back matches in tournaments, including a first-round exit in the US Open to Barbora Strýcová. After another first-round loss in the Japan Women's Open to Zarina Diyas, she exited the Top 100. She suffered further first-round losses to Irina Khromacheva in Hua Hin and world No. 79 and top seed Aryna Sabalenka in the $125k event in Taipei, Doi ended the year with just one more win in Hawaii, and ended the year ranked 119.
Doi then had two first round losses in Challenger-level events in the U.S., losing to wildcard Victoria Duval, 1-6 2-6 in the WTA 125 event at Newport Beach, and then to Bianca Andreescu in the $100k event in Midland.
Her ranking having dropped to 144, Doi dropped down to $25k event in Surprise, Arizona but was shocked in the second round by a French qualifier ranked 499. She then played three ITF and Challenger events, reaching a $25k quarterfinal in Rancho Santa Fe, and qualifying for the Oracle Challenger Indian Wells before falling in a final-set tiebreaker to Varvara Lepchenko.
After failing to qualify for Charleston, Doi played a number of ITF events with very limited success, winning only two matches and losing five. She then lost in the first round of qualifying for the French Open in straight sets to Rebecca Peterson.
Her ranking having plunged to 328, she returned to Asia to play a series of $25k events. This saw an upturn in form, winning the event in Kofu against five Japanese opponents, before then reaching the final of the event in Daegu in South Korea, before retiring injured 2-5 down in the final to Han Na-Lae. She then continued her improved form in the US, reaching a quarterfinal of a $60k event in Honolulu, losing to Jessica Pegula, before reaching a semifinal in Ashland, Kentucky, beating the top seed Caroline Dolehide on route, for her best ranking win of the season.
Doi then had a breakthrough in her season, by qualifying and winning a $100,000 ITF event in Vancouver, beating Heather Watson in the final. This provided her ranking a boost of around 80 places and meant she could play the qualifying event of the US Open - but lost in the first round to compatriot Nao Hibino, 4-6, 3-6.
After a first-round loss as a wildcard in Hiroshima, Doi qualified for the Pan Pacific Open before falling in the first round to Camila Giorgi. After an early exit in Tashkent, Doi qualified for the Tianjin Open, and had her best ranking win of the season by beating Yulia Putintseva, ranked 47. She then lost in the second round to Timea Bacsinszky. Her next breakthrough was at the $100k event in Shenzhen, where she reached semifinals - beating third seed Luksika Kumkhum, before losing to top seed Zheng Saisai. She ended season with a first-round loss to wildcard Sabine Lisicki in the WTA 125 event in Taipei.
Doi then entered five tournaments, winning only one match. She lost to Christina McHale in three sets (Newport Beach), to Margarita Betova in straight sets (St. Petersburg Trophy), in a third-set tiebreak to Georgina García Pérez in Japan's Fed Cup World Group II tie against Spain, in three sets to Magdalena Fręch in Dubai, and in straight sets to Donna Vekić (Mexican Open). Her sole win during this run was a three-set victory over Han Xinyun in Dubai.
Her form took a turn in Indian Wells, where she beat Francesca Di Lorenzo and Yanina Wickmayer to qualify, before defeating Ons Jabeur (WR55) in straight sets in the first round. She then took the opening set against top-5 player and fifth seed Karolína Plíšková, before falling 7-6, 1-6, 1-6. She repeated the feat in Miami, beating 71st-ranked Anastasia Potapova and Mandy Minella in qualifying, before defeating wildcard Wang Xinyu in the first round. She then lost in two tight sets to Polona Hercog. Her performances in both tournaments raised her ranking back up to just outside the top 100 once more, at 101.
Doi then hit a barren spell with six tour losses in a row (only winning two matches at Fed Cup World Group II playoffs against Netherlands), including a first-round loss at the French Open to seventh-ranked Sloane Stephens.
On grass, Doi beat Myrtille Georges in the $100k event in Manchester before losing to Wang Xiyu. She lost in the first round of the Birmingham Classic to Viktoriya Tomova, before falling in the second round of qualifying at Wimbledon. This meant she had fallen to around 117 in the world.
Doi then suddenly turned around her poor form with a run to the title in Bastad with wins over Australian Alison Bai, seventh-seeded Kazakh Elena Rybakina, fourth seeded German Mona Barthel, eighth-seeded Serbian Aleksandra Krunić, before beating Montenegrin Danka Kovinić in the final. The title was Doi's last WTA Tour title, and pushed her back into the top 100 rankings.
After a first-round loss in San Jose, Doi qualified for the Roger's Cup but lost in the first round to qualifier Ekaterina Alexandrova. She then lost in the first round of the $100k Vancouver Open, before losing in straight sets in the US Open to tenth seed Madison Keys.
Doi continued her good form with a run to the final in Hiroshima, beating both qualifier Junri Namigata and Australian qualifier Zoe Hives in a three-setter, as well as seventh seed Sara Sorribes Tormo, and second seed Veronika Kudermetova each one in straight sets. In the final, she lost to compatriot Nao Hibino - with whom she also took her last tour-level doubles title. She then reached the quarterfinals of the Pan Pacific Open, including beating world No. 21, Donna Vekić, in the second round. With these performances, she returned to world No. 74 in the rankings.
Her final tournaments were at the China Open, where she fell in qualifying, before qualifying in Linz with three-set wins over wildcard Melanie Klaffner and world No. 116, Jasmine Paolini. She lost to top seed Kiki Bertens in the main draw. Her final tournament of the season resulted in a three-set first-round loss to second seed Julia Görges in the Luxembourg Open.
Doi's year-end ranking had improved by 65 places on the previous year, ending the year ranked 74.
In her first tournaments after the pandemic break, Doi again struggled to consistently win at Tour level. She lost in the first round of the Top Seed Open to wildcard Shelby Rogers, before losing in qualifying for the WTA 1000 event in the Western & Southern Open to Oceane Dodin. She then lost in the first round to fourth seed and eventual champion Naomi Osaka in the US Open.
After a second-round appearance in the Istanbul Cup, Doi qualified for Rome, beating Martina Trevisan before falling 1-6 6-4 4-6 to 12th seed Markéta Vondroušová in the opening round. She then lost in the first round of the re-organised French Open in straight sets to 13th seed Petra Martić.
Doi returned to the ITF circuit for the final three tournaments of the season, reaching the quarter finals of an $80,000 event in Macon, the second round of an $80,000 event in Tyler, and then retired injured in the final set of the semi final of a $100,000 event in Charleston to Mayar Sherif, having defeated Robin Montgomery, Sara Errani, and Ann Li in the previous rounds. She finished the season ranked 82.
| Grand Slam tournaments | |||||||||||||||||
| Australian Open | Q1 | Q2 | Q1 | 2R | 1R | Q2 | 1R | 1R | Q1 | 1R | 1R | 1R | 1R | Q2 | 0 / 8 | 1–8 | |
| French Open | 1R | A | A | 1R | 1R | 2R | 1R | 1R | Q1 | 1R | 1R | 1R | 1R | 0 / 10 | 1–10 | ||
| Wimbledon | Q3 | 3R | 1R | 1R | 2R | 1R | 4R | 1R | A | Q2 | NH | 1R | 1R | 0 / 9 | 6–9 | ||
| US Open | Q2 | 1R | A | 1R | 1R | 2R | 1R | 1R | Q1 | 1R | 1R | 2R | Q3 | 0 / 9 | 2–9 | ||
| Win–loss | 0–1 | 2–2 | 0–1 | 1–4 | 1–4 | 2–3 | 3–4 | 0–4 | 0–0 | 0–3 | 0–3 | 1–4 | 0–3 | 0–0 | 0 / 36 | 10–36 | |
| WTA 1000 | |||||||||||||||||
| Dubai / Qatar Open | A | A | Q2 | A | A | Q1 | 1R | 2R | A | Q2 | 1R | 2R | A | 0 / 4 | 2–4 | ||
| Indian Wells Open | A | 1R | Q2 | Q1 | Q1 | Q1 | 1R | 1R | A | 2R | NH | 2R | 2R | 0 / 6 | 3–6 | ||
| Miami Open | A | Q1 | 1R | Q1 | Q1 | A | 1R | 1R | A | 2R | NH | Q1 | 1R | 0 / 5 | 1–5 | ||
| Madrid Open | A | A | A | A | A | Q2 | 1R | 3R | A | Q1 | NH | 1R | Q1 | 0 / 3 | 2–3 | ||
| Italian Open | A | A | A | A | A | 1R | QF | 1R | A | A | 1R | Q1 | Q1 | 0 / 4 | 3–4 | ||
| Canadian Open | A | Q1 | Q2 | A | A | 1R | 1R | Q2 | A | 1R | NH | A | A | 0 / 3 | 0–3 | ||
| Cincinnati Open | A | Q1 | A | A | A | Q2 | 3R | Q1 | A | A | Q1 | A | A | 0 / 1 | 1–1 | ||
| Pan Pacific / Wuhan Open | Q1 | 1R | Q1 | 2R | A | A | 2R | A | A | A | NH | 0 / 3 | 2–3 | ||||
| China Open | A | Q2 | A | 2R | Q1 | Q1 | 2R | A | A | Q2 | NH | 0 / 2 | 2–2 | ||||
| Guadalajara Open | NH | A | 0 / 0 | 0–0 | |||||||||||||
| Career statistics | |||||||||||||||||
| Tournaments | 3 | 11 | 9 | 15 | 10 | 15 | 27 | 17 | 3 | 14 | 8 | 21 | 13 | Career total: 167 | |||
| Titles | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Career total: 1 | |||
| Finals | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | Career total: 3 | |||
| Overall win–loss | 0–3 | 6–11 | 10–9 | 9–16 | 5–11 | 13–14 | 19–27 | 9–17 | 1–3 | 10–15 | 1–9 | 10–21 | 5–13 | 1 / 167 | 98–169 | ||
| Year-end ranking | 158 | 106 | 97 | 89 | 122 | 60 | 38 | 119 | 139 | 74 | 82 | 105 | 180 | $3,604,337 | |||
| Australian Open | 1R | 1R | A | 1R | 1R | 3R | 1R | A | 0 / 6 | 2–6 | ||
| French Open | 2R | A | A | 2R | 1R | 2R | 2R | 3R | 0 / 6 | 6–6 | ||
| Wimbledon | A | A | 1R | 2R | 2R | NH | 2R | 0 / 4 | 3–4 | |||
| US Open | A | 2R | A | 1R | 2R | A | 1R | 0 / 4 | 2–4 | |||
| Win–loss | 1–2 | 1–2 | 0–1 | 2–4 | 2–4 | 3–2 | 2–4 | 2–1 | 0 / 20 | 13–20 |
| {class="wikitable" style="font-size:90%;" !Legend |
| Grand Slam |
| WTA 1000 |
| WTA 500 |
| WTA 250 (1–2) |
| Hard (1–2) |
| Clay (0–0) |
| Grass (0–0) |
| Carpet (0–0) |
| Win | 1–0 | Luxembourg Open, Luxembourg | International | Hard (i) | Mona Barthel | ||
| Loss | 1–1 | Taiwan Open, Taiwan | International | Hard | 4–6, 2–6 | ||
| Loss | 1–2 | Japan Women's Open, Japan | International | Hard | Nao Hibino | 3–6, 2–6 |
| {class="wikitable" style="font-size:90%;" !Legend |
| Grand Slam |
| WTA 1000 |
| WTA 500 |
| WTA 250 (2–1) |
| Hard (2–1) |
| Grass (0–0) |
| Clay (0–0) |
| Carpet (0–0) |
| Win | 1–0 | İstanbul Cup, Turkey | International | Hard | Elina Svitolina | Oksana Kalashnikova Paula Kania | 6–4, 6–0 | |
| Loss | 1–1 | Japan Women's Open, Japan | International | Hard | Kurumi Nara | Chan Yung-jan Chan Hao-ching | 1–6, 2–6 | |
| Win | 2–1 | Japan Women's Open, Japan | International | Hard | Nao Hibino | Christina McHale Valeria Savinykh | 3–6, 6–4, 10–4 |
| Loss | 0–1 | Taipei Open, Taiwan | Carpet (i) | Tímea Babos | 5–7, 3–6 | |
| Win | 1–1 | San Antonio Open, United States | Hard | Anna-Lena Friedsam | 6–4, 6–4 | |
| Win | 2–1 | Båstad Open, Sweden | Clay | Danka Kovinić | 6–4, 6–4 | |
| Loss | 2–2 | Indian Wells Challenger, United States | Hard | Irina-Camelia Begu | 3–6, 3–6 |
| Win | 1–0 | Nanjing Ladies Open, China | Hard | Xu Yifan | Zhang Shuai Yaroslava Shvedova | 6–1, 6–4 | |
| Win | 2–0 | Newport Beach Challenger, US | Hard | Jil Teichmann | Jamie Loeb Rebecca Peterson | 7–6(7–4), 1–6, 10–8 | |
| Win | 3–0 | Bastad Open, Sweden | Clay | Natalia Vikhlyantseva | Alexa Guarachi Danka Kovinić | 7–5, 6–7(4–7), 10–7 | |
| Win | 4–0 | Bastad Open, Sweden (2) | Clay | Rebecca Peterson | Mihaela Buzărnescu Irina Khromacheva | w/o | |
| Loss | 4–1 | Open de Rouen, France | Hard (i) | Oksana Kalashnikova | Natela Dzalamidze Kamilla Rakhimova | 2–6, 5–7 |
| $100,000 tournaments (1–0) |
| $75/80,000 tournaments (2–0) |
| $50/60,000 tournaments (2–1) |
| $25,000 tournaments (0–4) |
| $10,000 tournaments (2–0) |
| Win | 1–0 | Mar 2009 | Kōfu International Open, Japan | 10,000 | Hard | Erika Sema | 7–5, 6–2 |
| Win | 2–0 | Jul 2009 | ITF Tokyo, Japan | 10,000 | Carpet | Sachie Ishizu | 6–1, 6–4 |
| Loss | 2–1 | Sep 2009 | ITF Makinohara, Japan | 25,000 | Carpet | Hsieh Su-wei | 6–2, 5–7, 6–7(4) |
| Loss | 2–2 | Oct 2009 | ITF Tokachi, Japan | 25,000 | Carpet | Tomoko Yonemura | 4–6, 6–7(3) |
| Loss | 2–3 | Mar 2010 | ITF Irapuato, Mexico | 25,000 | Hard | Monique Adamczak | 6–7(5), 6–2, 2–6 |
| Win | 3–3 | Nov 2010 | Toyota World Challenge, Japan | 75,000 | Carpet (i) | Junri Namigata | 7–5, 6–2 |
| Win | 4–3 | Apr 2014 | ITF Seoul, South Korea | 50,000 | Hard | Misa Eguchi | 6–1, 7–6(3) |
| Win | 5–3 | Jan 2015 | ITF Hong Kong, China SAR | 50,000 | Hard | Zhang Kailin | 6–3, 6–3 |
| Win | 6–3 | Aug 2018 | Vancouver Open, Canada | 100,000 | Hard | Heather Watson | 6–7(4), 6–1, 6–4 |
| Win | 7–3 | Oct 2021 | Tyler Pro Challenge, United States | 80,000 | Hard | Harriet Dart | 7–6(5), 6–2 |
| Loss | 7–4 | Mar 2023 | ITF Bengaluru, India | 25,000 | Hard | Misaki Matsuda | 5–7, 6–4, 6–7(6) |
| Loss | 7–5 | Jun 2023 | ITF Ricany, Czech Republic | 60,000 | Clay | Elvina Kalieva | 6–7(2), 0–6 |
| $100,000 tournaments (1–1) |
| $75/80,000 tournaments (1–3) |
| $50,000 tournaments (1–1) |
| $25,000 tournaments (3–3) |
| Win | 1–0 | Jul 2008 | ITF Miyazaki, Japan | 25,000 | Carpet | Kurumi Nara | Kimiko Date-Krumm Tomoko Yonemura | 4–6, 6–3, 10–7 |
| Loss | 1–1 | May 2009 | Kangaroo Cup, Japan | 50,000 | Carpet | Kurumi Nara | Sophie Ferguson Aiko Nakamura | 2–6, 1–6 |
| Loss | 1–2 | Apr 2010 | ITF Incheon, South Korea | 25,000 | Hard | Junri Namigata | Irina-Camelia Begu Erika Sema | 0–6, 6–7(8) |
| Loss | 1–3 | Apr 2010 | ITF Gimhae, South Korea | 25,000 | Hard | Junri Namigata | Chang Kyung-mi Lee Jin-a | 6–1, 4–6, 8–10 |
| Loss | 1–4 | Apr 2010 | ITF Changwon, South Korea | 25,000 | Hard | Junri Namigata | Chang Kyung-mi Lee Jin-a | 7–5, 3–6, 8–10 |
| Win | 2–4 | May 2010 | Fukuoka International, Japan | 50,000 | Carpet | Kotomi Takahata | Marina Erakovic Alexandra Panova | 6–4, 6–4 |
| Loss | 2–5 | Jul 2013 | Beijing Challenger, China | 75.000 | Hard | Miki Miyamura | Liu Chang Zhou Yimiao | 6–7(1), 4–6 |
| Win | 3–5 | Nov 2013 | Toyota World Challenge, Japan | 75.000 | Carpet (i) | Shuko Aoyama | Eri Hozumi Makato Ninomiya | 7–6(1), 2–6, 11–9 |
| Loss | 3–6 | May 2014 | Kangaroo Cup, Japan | 75.000 | Hard | Hsieh Shu-ying | Jarmila Gajdošová Arina Rodionova | 3–6, 3–6 |
| Win | 4–6 | Feb 2018 | ITF Surprise, United States | 25,000 | Hard | Yanina Wickmayer | Jacqueline Cako Caitlin Whoriskey | 2–6, 6–3, 10–8 |
| Win | 5–6 | Feb 2018 | ITF Kōfu, Japan | 25,000 | Hard | Misa Eguchi | Megumi Nishimoto Kotomi Takahata | 6–3, 6–7(2), 10–8 |
| Win | 6–6 | Oct 2018 | Suzhou Ladies Open, China | 100,000 | Hard | Nao Hibino | Luksika Kumkhum Peangtarn Plipuech | 6–2, 6–3 |
| Loss | 6–7 | Oct 2021 | Tyler Pro Challenge, United States | 80,000 | Hard | Katarzyna Kawa | Giuliana Olmos Marcela Zacarías | 5–7, 6–1, 5–10 |
| Loss | 6–8 | Oct 2022 | ITF Les Franqueses del Vallès, Spain | 100,000 | Hard | Beatrice Gumulya | Aliona Bolsova Rebeka Masarova | 5–7, 6–1, 3–10 |
| 1 |
| 2017 | ||||||
| 1. | Madison Keys | No. 10 | Madrid Open, Spain | Clay | 1R | 6–4, 4–6, 6–4 Mutua Madrid Open 2017 results WTA official website, retrieved 8 April 2021 |
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