| Haruka Kaji | |
| Birth Date: | 1994 9, df=yes |
| Birth Place: | Tsuyama, Okayama, Japan[1] |
| Plays: | Right-handed (two-handed backhand) |
| Careerprizemoney: | $184,387 |
| Singlestitles: | 6 ITF |
| Highestsinglesranking: | No. 213 (25 September 2023) |
| Currentsinglesranking: | No. 300 (5 August 2024) |
| Usopenresult: | Q2 (2023) |
| Doublestitles: | 6 ITF |
| Highestdoublesranking: | No. 131 (3 February 2020) |
| Updated: | 5 August 2024 |
is a Japanese professional tennis player.
She has career-high WTA rankings of 213 in singles, achieved on 25 September 2023, and 131 in doubles, set on 3 February 2020.
Kaji won her biggest ITF title to date at the 2019 Challenger de Granby, in the doubles tournament, partnering Ingrid Neel.
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| Result | class=unsortable | W–L | Date | Tournament | Tier | Surface | Opponent | class=unsortable | Score |
|---|---|---|---|---|---|---|---|---|---|
| Win | 1–0 | Dec 2015 | ITF Hong Kong | W10 | Hard |  Tori Kinard | 6–1, 3–6, 2–2 ret. | ||
| Loss | 1–1 | Oct 2016 | ITF Tarakan, Indonesia | W10 | Hard (i) | Kaitlyn Christian | 7–5, 3–6, 2–6 | ||
| Win | 2–1 | Jun 2017 | Kofu Women's Cup, Japan | W25 | Hard |  Olivia Tjandramulia | 6–1, 6–3 | ||
| Loss | 2–2 | Jun 2017 | ITF Taipei, Taiwan | W15 | Hard | Lee Pei-chi | 6–3, 5–7, 2–6 | ||
| Win | 3–2 | Aug 2017 | ITF Nonthaburi, Thailand | W15 | Hard | Lee Hua-chen | 6–4, 6–1 | ||
| Win | 4–2 | Dec 2017 | ITF Hong Kong | W15 | Hard |  Hiroko Kuwata | 4–6, 6–2, 7–6(4) | ||
| Loss | 4–3 | Aug 2019 | ITF Tsukuba, Japan | W25 | Hard (i) | Akiko Omae | 6–3, 6–7(5), 3–6 | ||
| Loss | 4–4 | Sep 2019 | ITF Kyoto, Japan | W25 | Hard (i) | Lee Ya-hsuan | 3–6, 4–6 | ||
| Win | 5–4 | Oct 2022 | Noto International, Japan | W25 | Carpet | Momoko Kobori | 3–6, 6–3, 6–3 | ||
| Win | 6–4 | Oct 2022 | ITF Hamamatsu, Japan | W25 | Carpet | Ikumi Yamazaki | 1–1 ret. | ||
| Loss | 6–5 | May 2023 | ITF Karuizawa, Japan | W25 | Grass |  Wang Yafan | 0–6, 1–6 | ||
| Loss | 6–6 | Aug 2024 | ITF Roehampton, United Kingdom | W35 | Hard |  Sonay Kartal | 3–6, 1–6 |
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| Result | class=unsortable | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | class=unsortable | Score |
|---|---|---|---|---|---|---|---|---|---|---|
| Win | 1–0 | Mar 2015 | ITF Kofu, Japan | W10 | Hard | Aiko Yoshitomi | Rika Fujiwara Akari Inoue | 6–2, 6–3 | ||
| Loss | 1–1 | Dec 2015 | ITF Hong Kong | W10 | Hard | Mana Ayukawa |  Emma Laine Yukina Saigo | w/o | ||
| Win | 2–1 | Jun 2016 | ITF Kaohsiung, Taiwan | W10 | Hard | Erina Hayashi | Chen Pei-hsuan Wu Fang-hsien | 6–4, 3–6, [10–7] | ||
| Win | 3–1 | Jun 2018 | ITF Singapore | W25 | Hard | Akiko Omae |  Han Na-lae Lee So-ra | 7–5, 6–2 | ||
| Win | 4–1 | Feb 2019 | ITF Jodhpur, India | W25 | Hard | Mana Ayukawa | Eri Hozumi Miyabi Inoue | 7–6(4), 4–6, [10–5] | ||
| Loss | 4–2 | May 2019 | ITF Nonthaburi, Thailand | W25 | Hard | Risa Ozaki | Aleksandrina Naydenova  İpek Soylu | 1–6, 3–6 | ||
| Win | 5–2 | Jun 2019 | ITF Jakarta, Indonesia | W25 | Hard | Junri Namigata | Beatrice Gumulya Jessy Rompies | 6–2, 4–6, [10–7] | ||
| Loss | 5–3 | Jul 2019 | ITF Saskatoon, Canada | W25 | Hard | Momoko Kobori | Hsu Chieh-yu  Marcela Zacarías | 3–6, 2–6 | ||
| Win | 6–3 | Jul 2019 | Challenger de Granby, Canada | W80 | Hard | Junri Namigata | Quinn Gleason Ingrid Neel | 7–6(5), 5–7, [10–8] | ||
| Loss | 6–4 | Nov 2019 | ITF Tokyo Open, Japan | W100 | Hard | Junri Namigata | Choi Ji-hee Han Na-lae | 3–6, 3–6 |