• Currently without a full-time coach; has trained at National Training Center in Tokyo since 2008
• Father is a businessman; mother is a housewife; older brother, Ryota, is a tennis coach; introduced to tennis at age 6 by parents
• All-court player who likes being aggressive; idol growing up was Henin "because she's small in stature but had a very aggressive game"
• Away from the court, enjoys shopping and watching Japanese movies

Career Highlights

SINGLES
Winner (1): 2015 - Luxembourg.
Finalist (2): 2019 - Hiroshima; 2016 - Kaohsiung.

DOUBLES
Winner (2): 2019 - Hiroshima (w/Hibino), 2014 - Istanbul (w/Svitolina).
Finalist (1): 2015 - Tokyo [Japan Open] (w/Nara).

WTA 125 TITLES
SINGLES (2): 2019 - Bastad; 2016 - San Antonio.

ADDITIONAL
Japanese Fed Cup Team, 2011, 2013-15, 2017, 2019-20; Japanese Olympic Team, 2016.

Career in Review

Ended last season by lifting seventh ITF Circuit title of her career, at W80 Tyler, USA

In Tour-level events last season, reached 3r at Phillip Island Trophy and made 2r on nine further occasions

Best result of 2020 was R-Up finish at WTA 125K Series event at Indian Wells (l. Begu), while at Tour-level, sole main draw win came in 2r showing at Istanbul

Appeared in her third WTA final at 2019 Hiroshima, falling to compatriot Hibino in the first all-Japanese final since 1997 when Sawamatsu defeated Yoshida in Jakarta

She later teamed with Hibino and won the Hiroshima doubles title - her first appearance in a WTA doubles final in four years

Also in 2019, swept singles and doubles titles at WTA 125K Series event at Bastad

Highlights of 2018 campaign came on the ITF Circuit, winning her sixth and seventh career titles at $25k Kofu-JPN and $100k Vancouver-CAN

Best results in 2017 were SF at Nurnberg, QF at Taipei City and 3r run at Madrid

Posted career-best finish in 2016 at No.38 (up from No.60 in 2015) while also posting new career-high ranking of No.30 (week of October 10, 2016)Notched up career-best 24 main draw match wins in 2016. Highlights were reaching second WTA singles final at Kaohsiung (l. V.Williams) and best Slam showing with R16 run at Wimbledon (d. No.17 Pliskova in 2r, l. eventual R-Up Kerber)

Represented Japan at 2016 Rio Olympics, reaching 2r in singles (l. Stosur) and 2r in doubles (w/Hozumi, l. Kasatkina/Kuznetsova)

Best result of 2016 clay season was Premier-level QF at 2016 Rome (d. No.15 Safarova in 2r, l. Begu). At the time was the first Japanese player to reach QF at Premier-level tournament or above since 2014, when Date made Birmingham QF

In March 2016, won the WTA 125k Series event at San Antonio (d. Friedsam in F)

Won maiden WTA singles title at 2015 Luxembourg (d. Barthel in F); scored first Top 20 win of her career en route to title, over No.20 Petkovic in 1r

Lifted first WTA doubles title at 2014 Istanbul (w/Svitolina)

In 2012, advanced to first WTA QF, at Birmingham, and SF, at Osaka

Member of Japanese Fed Cup Team, 2011, 2013-15, 2017, 2019-20

Scored first WTA main draw win at 2011 Kuala Lumpur (fourth tour-level main draw) and first back-to-back wins during 3r run at 2011 Wimbledon (eighth main draw)

Played first WTA qualifying at 2009 Osaka; made main draw debut at 2010 Roland Garros

In final tournament of career, Doi victorious over Martic in Tokyo

Hartono needs eight match points to stop Doi

Happy New Year! Players ring in 2023 from Australia, New Zealand

Jang triumphs over Masarova at Bastad 125 for career-best title

Indian Wells: Keys holds off Doi in three sets to win opener

Indian Wells: Doi notches comeback win over Potapova