Stadion: Indoor 6 Round: 25 Ground: Hardcourt outdoor
| ITF Damen - Kurume | 2017/05/17 01:00 | Ayaka Okuno v Erina Hayashi | 6-7,0-6 |
| ITF Damen - Fukuoka | 2017/05/10 01:00 | Ayaka Okuno v Erina Hayashi | 3-6,3-6 |
| ITF Damen - Toyota - Qualifikation | 2018/03/10 01:00 | Aiko Yoshitomi v Erina Hayashi | 6-2,6-1 |
| ITF Damen - Mallorca | 2018/02/26 10:30 | Eden Silva v Erina Hayashi | 6-2,6-3 |
| ITF Damen - Mallorca | 2018/02/23 09:35 | Erina Hayashi v Isabella Shinikova | 2-6,7-5,1-6 |
| ITF Damen - Mallorca | 2018/02/20 14:00 | Isabel A Gallego v Erina Hayashi | 6-1,0-6,2-6 |
| ITF Damen - Mallorca | 2018/02/15 09:00 | Isabella Shinikova v Erina Hayashi | 4-6,6-1,6-3 |
| ITF Damen - Mallorca | 2018/02/14 09:00 | Laura Lopez Giese v Erina Hayashi | 6-7,2-6 |
| ITF Damen - Taiwan | 2017/06/22 04:15 | Alexandra Bozovic v Erina Hayashi | 6-2,6-2 |
| ITF Damen - Taiwan | 2017/06/20 01:30 | Pei Hsuan Chen v Erina Hayashi | 5-7,6-1,3-6 |
| ITF Damen - Toyota - Qualifikation | 2018/03/10 01:00 | Ayaka Okuno v Kyoka Okamura | 1-6,3-6 |
| ITF Damen - Yokohama - Qualifikation | 2018/03/04 07:00 | Ayaka Okuno v Ya-Hsuan Lee | 4-6,4-6 |
| ITF Damen - Surprise - Qualifikation | 2018/02/11 17:00 | Giuliana Olmos v Ayaka Okuno | 6-2,1-6,6-2 |
| ITF Damen - Hong Kong | 2018/01/02 04:10 | Luksika Kumkhum v Ayaka Okuno | 6-1,6-2 |
| ITF Damen - Toyota - Qualifikation | 2017/11/12 02:00 | Ayaka Okuno v Nozomi Ohya | 2-6,3-6 |
| ITF Damen - Shenzhen - Qualifikation | 2017/11/06 03:00 | Ayaka Okuno v Zhuoma Ni Ma | 1-6,7-6,2-6 |
| ITF Damen - Hamamatsu | 2017/10/18 01:50 | Mitsumi Kawasaki v Ayaka Okuno | 6-1,6-1 |
| ITF Damen - Makinohara | 2017/10/11 00:30 | Ayaka Okuno v Megumi Nishimoto | 3-6,0-6 |