Coached by Eiji Takeuchi Named after former Top 20 player Naoko Sawamatsu; brother is named after Shuzo Matsuoka; says family is tennis crazy Started playing tennis at age 10.

SINGLES Winner (3): 2023 - Prague; 2019 - Hiroshima; 2015 - Tashkent. Finalist (4): 2017 - Kuala Lumpur, Nanchang; 2016 - Tashkent. DOUBLES Winner (3): 2023 - Prague (w/Kalashnikova); 2019 - Hiroshima (w/Doi); 2017 - Monterrey (w/Rosolska) Finalist (5): 2024 - Makarska(WTA 125, w/Kalashnikova); 2021 - Istanbul (w/Ninomiya); 2019 - Tianjin (w/Kato); 2018 - Taipei City (w/Kalashnikova); 2017 - Tashkent (w/Kalashnikova) WTA 125 DOUBLES Finalist (2): 2024 - Hong Kong (Ninomiya), Makarska (w/Kalashnikova).

Highlight of 2024 season was reaching 2r at Dubai, Hua Hin, Indian Wells, and Hong Kong. Also made three QF runs at WTA 125s at Hong Kong, Makarska, and Canberra.

In 2023 lifted the singles and doubles (w/Kalashnikova) titles at Prague, her first Tour level titles since 2019 (in both, doubles and singles)

Advanced to her sixth and seventh career Tour-level SFs in 2020, at Hua Hin (l. Kung) and Strasbourg (l. Rybakina). Prior to 2020, was 5-0 in SF stage at Tour-level

Reached 2r at the Grand Slams for her second and third time in her career in 2020, at Australian Open (as qualifier, l. Sakkari) and Roland Garros (l. Jabeur). First reached 2r at a major at 2017 US Open (l. Safarova)

Owns two Top 20 wins in her career, having upset No.18 Stosur at 2016 Hong Kong and No.4 Svitolina at 2020 Hua Hin

Season highlight in 2019 was singles and doubles sweep at 2019 Hiroshima (w/Doi, whom she beat in singles final). Also reached 2r at Monterrey (l. Vickery) and fell 1r four times

In 2018, won one singles and one doubles title on ITF Circuit

Posted third Top 100 finish in 2017, having reached finals in Kuala Lumpur (l. Barty in F) and Nanchang (l. Peng)

Standout results in 2016 included reaching second WTA singles final at Tashkent (as defending champion, l. Kr.Pliskova) and advancing to QF at Auckland (l. Goerges), Istanbul (l. Buyukakcay) and Florianopolis (l. Begu)

Made Top 100 debut on October 5, 2015, jumping from No.117 to No.76 after winning career first WTA singles title at Tashkent (d. Vekic in F) in what was her second Tour-level main draw

Nominated for WTA Newcomer of the Year in 2015 (media vote; won by Gavrilova)

Made WTA main draw debut in September 2015 at Tokyo [Japan Open], reaching 2r (d. Kuwata, l. Brengle)

Japanese Fed Cup Team, 2016, 2019; Japanese Olympic Team, 2016

Made professional debut on ITF Circuit at $25k ITF/Karuizawa-JPN in 2012 (fell in qualifying), however won next tournament played at $10k ITF/Tokyo-JPN