Stadium: Indoor 7 Round: 62 Ground: Synthetic outdoor
| Hamamatsu, Singles W-WITF-JPN-12A | 2018/10/14 04:30 | 코시이시, 아유미 v 아이카와, 마유카 | 6-3,6-2 |
| Hamamatsu, Singles W-WITF-JPN-12A | 2018/10/14 00:00 | 코시이시, 아유미 v 치카라이시, 유이 | 7-6,6-2 |
| Makinohara, Singles Qualifying W-WITF-JPN-15A | 2018/10/11 00:30 | 코시이시, 아유미 v 오제키, 미치카 | 2-6,0-6 |
| Makinohara, Singles Qualifying W-WITF-JPN-15A | 2018/10/09 00:30 | 코시이시, 아유미 v Yoshioka, Kisa | 7-5,6-3 |
| ITF Women Nanao | 2018/08/30 03:00 | 코시이시, 아유미 v 시미즈, 아야노 | 5-7,3-6 |
| ITF Women Nanao | 2018/08/29 03:30 | 코시이시, 아유미 v 키날드, 토리 | 7-5,5-7,6-4 |
| ITF Women Nanao | 2018/08/27 05:15 | 코시이시, 아유미 v 셰이, 위-팅 | 6-0,6-0 |
| ITF Women Nanao | 2018/08/26 05:00 | 코시이시, 아유미 v Ozeki, Ayaka | 4-6,6-3,6-3 |
| Hamamatsu, Singles W-WITF-JPN-12A | 2018/10/14 04:00 | Tsutsumi, Karen v Goto, Aoiko | 4-6,7-5,6-1 |
| Hamamatsu, Singles W-WITF-JPN-12A | 2018/10/14 00:00 | Tsutsumi, Karen v Shindo, Marie | 6-3,7-6 |