Haruka Kaji
Haruka Kaji is a Japanese professional tennis player.
Kaji has a career-high singles ranking of 283, achieved on 29 January 2018. She also has a career-high WTA doubles ranking of 156, set on 23 September 2019.
Kaji won her biggest ITF title to date at the 2019 Challenger Banque Nationale de Granby.
ITF Circuit finals
Singles: 8 (4 titles, 4 runner–ups)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Dec 2015 | ITF Hong Kong S.A.R. | 10,000 | Hard |  Tori Kinard | 6–1, 3–6, 2–2 ret. |
| Loss | 1–1 | Oct 2016 | ITF Tarakan, Indonesia | 10,000 | Hard | Kaitlyn Christian | 7–5, 3–6, 2–6 |
| Win | 2–1 | Jun 2017 | ITF Kofu, Japan | 25,000 | Hard |  Olivia Tjandramulia | 6–1, 6–3 |
| Loss | 2–2 | Jun 2017 | ITF Taipei, Taiwan | 15,000 | Hard |  Lee Pei-chi | 6–3, 5–7, 2–6 |
| Win | 3–2 | Aug 2017 | ITF Nonthaburi, Thailand | 15,000 | Hard | Lee Hua-chen | 6–4, 6–1 |
| Win | 4–2 | Dec 2017 | ITF Hong Kong S.A.R. | 15,000 | Hard |  Hiroko Kuwata | 4–6, 6–2, 7–6 |
| Loss | 4–3 | Aug 2019 | ITF Tsukuba, Japan | 25,000 | Hard | Akiko Omae | 6–3, 6–7, 3–6 |
| Loss | 4–4 | Sep 2019 | ITF Kyoto, Japan | 25,000 | Hard | Lee Ya-hsuan | 3–6, 4–6 |
Doubles: 10 (6 titles, 4 runner–ups)
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Win | 1–0 | Mar 2015 | ITF Kofu, Japan | $10,000 | Hard | Aiko Yoshitomi | Rika Fujiwara Akari Inoue | 6–2, 6–3 |
| Loss | 1–1 | Dec 2015 | ITF Hong Kong S.A.R. | $10,000 | Hard | Mana Ayukawa |  Emma Laine Yukina Saigo | w/o |
| Win | 2–1 | Jun 2016 | ITF Kaohsiung, Taiwan | $10,000 | Hard | Erina Hayashi | Chen Pei-hsuan Wu Fang-hsien | 6–4, 3–6, |
| Win | 3–1 | Jun 2018 | ITF Singapore | $25,000 | 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, 4–6, |
| 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, |
| Loss | 5–3 | Jul 2019 | ITF Saskatoon, Canada | W25 | Hard | Momoko Kobori | Hsu Chieh-yu  Marcela Zacarias | 3–6, 2–6 |
| Win | 6–3 | Jul 2019 | ITF Granby, Canada | W80 | Hard | Junri Namigata | Quinn Gleason Ingrid Neel | 7–6, 5–7, |
| Loss | 6–4 | Nov 2019 | ITF Tokyo, Japan | W100 | Hard | Junri Namigata | Choi Ji-hee Han Na-lae | 3–6, 3–6 |