Ayumi Oka

is a Japanese former professional tennis player. Most time of her career, she played on the ITF Women's Circuit.

In June 2009, she reached her highest singles ranking of 297 by the Women's Tennis Association (WTA). In July 2010, she reached her best WTA doubles ranking of 219.

ITF Circuit finals $100,000 tournaments $75,000 tournaments $50,000 tournaments $25,000 tournaments $10,000 tournaments

Singles (2–0) OutcomeNo.DateTournamentSurfaceOpponentScoreWinner 1. 9 September 2007 ITF Kyoto, Japan Carpet (i) Haruka Fujishiro 6–1, 4–6, 6–3Winner 2. 22 August 2011 ITF Saitama, Japan Hard Duan Yingying 6–3, 6–4

Doubles (13–10) OutcomeNo.DateTournamentSurfacePartnerOpponentsScoreWinner 1. 12 June 2005 ITF Tokyo, Japan Hard Natsuko Kurita Nozomi Aiba Kana Okawa 6–3, 6–4Winner 2. 4 June 2007 ITF Tokyo, Japan Hard Mari Tanaka Tomoko Taira Etsuko Kitazaki 3–6, 6–1, 6–4Winner 3. 22 July 2007 Kurume Cup, Japan Grass Tomoko Sugano Liu Wanting Song Shanshan 6–4, 6–1Winner 4. 22 September 2007 Tsukuba, Japan Hard Tomoko Sugano Natsumi Hamamura Ayaka Maekawa 6–2, 6–3Runner-up 5. 19 November 2007 Manila, Philippines Hard Kei Sekine Chen Yi Kao Shao-yuan 6–7(5–7), 1–6Runner-up 6. 3 May 2008 Balikpapan, Indonesia Hard Tomoko Sugano Sandy Gumulya Lavinia Tananta 3–6, 6–4, [7–10]Winner 7. 22 June 2008 Sutama, Japan Clay Ayaka Maekawa Kazusa Ito Tomoko Taira 6–3, 6–4Runner-up 8. 13 July 2008 Tokyo, Japan Carpet Varatchaya Wongteanchai Chang Kyung-mi Chae Kyung-yee 6–3, 2–6, [7–10]Winner 9. 20 September 2008 Kyoto, Japan Carpet (i) Varatchaya Wongteanchai Maki Arai Yurina Koshino 5–7, 6–2, [10–2]Runner-up 10. 1 June 2009 Komoro, Japan Clay Varatchaya Wongteanchai Zhang Shuai Xu Yifan 2–6, 1–6Winner 11. 8 June 2009 Tokyo, Japan Hard Mari Tanaka Maki Arai Yurina Koshino 7–6, 6–0Winner 12. 2 August 2009 Obihiro, Japan Carpet Natsumi Hamamura Rika Fujiwara Kurumi Nara 3–6, 6–1, [10–5]Winner 13. 23 May 2010 Karuizawa, Japan Carpet Akiko Yonemura Sun Shengnan Xu Yifan 7–6 (7–1), 6–3Runner-up 14. 2 August 2010 Niigata, Japan Carpet Miki Miyamura Akari Inoue Kotomi Takahata 1–6, 4–6Runner-up 15. 19 September 2010 Kyoto, Japan Carpet (i) Kaori Onishi Kazusa Ito Tomoko Taira 3–6, 6–7(5–7)Winner 16. 20 March 2011 Miyazaki, Japan Carpet Mari Inoue Chinami Ogi Yuuki Tanaka 5–7, 6–2, [10–8]Winner 17. 15 May 2011 Kurume Cup, Japan Grass Akiko Yonemura Rika Fujiwara Tamarine Tanasugarn 6–3, 5–7, [10–8]Runner-up 18. 22 May 2011 Karuizawa, Japan Carpet (i) Natsumi Hamamura Rika Fujiwara Shuko Aoyama 4–6, 4–6Runner-up 19. 14 May 2011 Niigata, Japan Hard Akari Inoue Natsumi Hamamura Erika Sema 1–6, 2–6Runner-up 20. 22 August 2011 Saitama, Japan Hard Akari Inoue Liu Wanting Liang Chen 3–6, 7–5, [9–11]Runner-up 21. 11 September 2011 Nato, Japan Carpet Natsumi Hamamura Kanae Hisami Varatchaya Wongteanchai 6–1, 6–7(4–7), [12–14]Winner 22. 30 October 2011 Hamanako, Japan Carpet Natsumi Hamamura Huỳnh Phương Đài Trang Varatchaya Wongteanchai 6–3, 6–3Winner 23. 23 March 2012 ITF Kofu, Japan Hard Kotomi Takahata Eri Hozumi Remi Tezuka 6–4, 5–7, [10–3]