Name: Ayumi Koshiishi
Country: Japan
Birthdate: 28.07.00, 20 years
WTA ranking: 898
TOP ranking's position: 609 (15.04.19, 2400 points)
Points: 18
Prize money: 14.294 $
Matches total: 151
Win: 84
%: 55.63 %
Country: Japan
Birthdate: 28.07.00, 20 years
WTA ranking: 898
TOP ranking's position: 609 (15.04.19, 2400 points)
Points: 18
Prize money: 14.294 $
Matches total: 151
Win: 84
%: 55.63 %
| year | summary | Hard | Clay | I. hard | Carpet | Grass | Acrylic |
| 2020 | 9/4 | 9/4 | 0/0 | 0/0 | 0/0 | 0/0 | 0/0 |
| 2019 | 22/23 | 13/13 | 5/5 | 4/3 | 0/2 | 0/0 | 0/0 |
| 2018 | 30/21 | 23/18 | 0/0 | 0/0 | 7/3 | 0/0 | 0/0 |
| 2017 | 13/12 | 7/5 | 0/0 | 0/1 | 6/6 | 0/0 | 0/0 |
| 2016 | 10/7 | 1/3 | 0/0 | 2/1 | 7/3 | 0/0 | 0/0 |
| TOTAL | 84/67 | 53/43 | 5/5 | 6/5 | 20/14 | 0/0 | 0/0 |
| perc. % | 55.63 % | 55.21 % | 50 % | 54.55 % | 58.82 % | 0 % | 0 % |
Ayumi Koshiishi / Fixtures
| 26.10.20 | q 2 | Ayumi Koshiishi | Vicky Van De Peer | match details |  W15 Heraklion | Clay |
Ayumi Koshiishi / Latest Scores
| 23.02.20 | q 1 | Alana Parnaby | Ayumi Koshiishi | 2-6, 6-4, 17-15 |  | match details |  W25 Perth | Hard |
| 18.02.20 | qual. | Alicia Smith | Ayumi Koshiishi | 7-5, 7-62 | | match details | W25 Perth | Hard |
| 17.02.20 | q 2 | Ayumi Koshiishi | Lara Tovich | 6-0, 6-0 |  | match details | ||
| 16.02.20 | q 1 | Ayumi Koshiishi | Luna Jokanovic | 6-1, 6-4 | | match details | ||
| 30.01.20 | 2nd round | Margot Yerolymos | Ayumi Koshiishi | 6-2, 6-3 | | match details |  W15 Manacor | Hard |
| 29.01.20 | 1st round | Ayumi Koshiishi | Fiona Ganz | 6-1, 6-4 | | match details | ||
| 28.01.20 | qual. | Ayumi Koshiishi | Eun Ji Lee | 6-0, 6-1 | | match details | ||
| 27.01.20 | q 2 | Ayumi Koshiishi | Jerricka Boone | 6-4, 6-4 | | match details | ||
| 26.01.20 | q 1 | Ayumi Koshiishi | Nina Ugrelidze | 6-1, 6-2 | | match details | ||
| 23.01.20 | q 2 | Ayumi Koshiishi | Haine Ogata | 6-1, 6-3 | | match details | W15 Manacor | Hard |
| 23.01.20 | qual. | Ayumi Koshiishi | Kathleen Kanev | 6-4, 6-1 | | match details | ||
| 23.01.20 | 1st round | Celia Cervino Ruiz | Ayumi Koshiishi | 6-0, 7-65 | | match details | ||
| 22.01.20 | q 1 | Ayumi Koshiishi | Jillian Louise Roa | 6-2, 6-1 | | match details | ||
| 16.10.19 | 1st round | Sakura Hosogi | Ayumi Koshiishi | 4-0, Ayumi Koshiishi - retired | | match details |  W15 Hua | Hard |
| 10.10.19 | 2nd round | Patcharin Cheapchadej | Ayumi Koshiishi | 6-1, 6-3 | | match details | W15 Hua | Hard |
| 09.10.19 | 1st round | Ayumi Koshiishi | Mananchaya Sawangkaew | 6-2, 6-3 | | match details | ||
| 05.09.19 | 2nd round | Michika Ozeki | Ayumi Koshiishi | 6-0, 6-3 | | match details |  W25 Kyoto | I. hard |
| 04.09.19 | 1st round | Ayumi Koshiishi | Miharu Imanishi | 6-3, 6-4 | | match details | ||
| 02.09.19 | qual. | Ayumi Koshiishi | Utaka Kishigami | 7-5, 7-64 | | match details | ||
| 01.09.19 | q 1 | Ayumi Koshiishi | Hx Izabella Tan | 6-0, 6-1 | | match details | ||
| 27.08.19 | 1st round | Anri Nagata | Ayumi Koshiishi | 6-4, 6-0 | | match details | W25 Nanao | Carpet |
| 19.08.19 | q 1 | Yui Chikaraishi | Ayumi Koshiishi | 2-6, 6-2, 10-7 | | match details | W25 Tsukuba | Hard |
| 30.07.19 | qual. | Yidi Yang | Ayumi Koshiishi | 6-0, 6-2 | | match details | W25 Nonthaburi | Hard |
| 29.07.19 | q 1 | Ayumi Koshiishi | Thasaporn Naklo | 6-3, 6-4 | | match details | ||
| 23.07.19 | qual. | Michika Ozeki | Ayumi Koshiishi | 6-2, 6-4 | | match details | W25 Nonthaburi | Hard |
| 22.07.19 | q 1 | Ayumi Koshiishi | Ho Ching Wu | 6-3, 6-2 | | match details | ||
| 20.06.19 | 2nd round | Sunam Jeong | Ayumi Koshiishi | 6-2, 7-60 | | match details |  W15 Gimcheon | Hard |
| 19.06.19 | 1st round | Ayumi Koshiishi | Honoka Kobayashi | 4-6, 6-4, 6-4 | | match details | ||
| 14.06.19 | 1/4 | Misaki Matsuda | Ayumi Koshiishi | 7-5, 6-74, 6-3 | | match details | W15 Gimcheon | Hard |
| 13.06.19 | 2nd round | Ayumi Koshiishi | Shou Na Mu | 7-5, 6-3 | | match details | ||
| 12.06.19 | 1st round | Ayumi Koshiishi | Dayeon Back | 7-5, 6-2 | | match details | ||
| 05.06.19 | qual. | Ayumi Koshiishi | So-Ra Lee | 7-5, 6-2 | | match details | W25 Daegu | Hard |
| 04.06.19 | 1st round | Na-Lae Han | Ayumi Koshiishi | 6-3, 4-1, Ayumi Koshiishi - retired | | match details | ||
| 03.06.19 | q 1 | Ayumi Koshiishi | Yeong Won Jeong | 4-1, Yeong Won Jeong - retired | | match details | ||
| 28.05.19 | 1st round | Jessica Ho | Ayumi Koshiishi | 6-3, 6-1 | | match details |  W25 Luzhou | Hard |
| 28.05.19 | qual. | Ayumi Koshiishi | Wanning Zhu | 6-0, 6-1 | | match details | ||
| 21.05.19 | qual. | Chang Liu | Ayumi Koshiishi | 6-3, 4-6, 10-8 | | match details | W25 Goyang | Hard |
| 20.05.19 | q 1 | Ayumi Koshiishi | Hyeran Yun | 6-4, 6-3 | | match details | ||
| 14.05.19 | qual. | Dabin Oh | Ayumi Koshiishi | 3-6, 6-3, 10-5 | | match details | W25 Changwon | Hard |
| 13.05.19 | q 1 | Ayumi Koshiishi | Si On Park | 6-0, 6-1 | | match details | ||
| 06.05.19 | q 1 | Mai Hontama | Ayumi Koshiishi | 3-6, 6-3, 10-2 | | match details | W60 Fukuoka | Carpet |
| 08.04.19 | q 1 | Mihika Yadav | Ayumi Koshiishi | 3-6, 6-2, 10-4 | | match details |  W25 Hong | Hard |
| 03.04.19 | 1st round | Ann Li | Ayumi Koshiishi | 6-1, 6-2 | | match details |  W25 Jackson | Clay |
| 02.04.19 | qual. | Ayumi Koshiishi | Alesya Yakubovich | 6-3, 6-2 | | match details | ||
| 24.03.19 | q 1 | Yuuki Tanaka | Ayumi Koshiishi | 6-3, 6-1 | | match details | W25 Canberra | Clay |
| 22.03.19 | 1/4 | Eudice Wong Chong | Ayumi Koshiishi | 6-2, 6-3 | | match details | W15 Xiamen | Hard |
| 21.03.19 | 2nd round | Ayumi Koshiishi | Qianhui Tang | 7-5, 6-74, 3-0, Qianhui Tang - retired | | match details | ||
| 20.03.19 | 1st round | Ayumi Koshiishi | Ashmitha Easwaramurthi | 6-0, 6-1 | | match details | ||
| 21.02.19 | 2nd round | Anastasia Zakharova | Ayumi Koshiishi | 6-4, 6-4 | | match details |  W15 Shymkent | I. hard |
| 20.02.19 | 1st round | Ayumi Koshiishi | Anastasia Astakhova | 6-2, 6-4 | | match details |
