Stadium: COURT A Round: 54 Ground: Synthetic outdoor
| Makinohara, Singles Qualifying W-WITF-JPN-15A | 2018/10/07 03:00 | Takahata, Kotomi v Kajitani, Robu | 7-5,7-5 |
| ITF Women Nanao | 2018/08/29 05:20 | Takahata, Kotomi v Haruka Kaji | 6-7,2-6 |
| ITF Women Nanao | 2018/08/27 01:00 | Takahata, Kotomi v Shuto, Minami | 7-6,6-3 |
| ITF Women Nanao | 2018/08/26 03:25 | Takahata, Kotomi v Ayano Sonoda | 6-4,6-0 |
| Tsukuba, Singles W-WITF-JPN-09A | 2018/08/19 03:00 | So, Kumi v Takahata, Kotomi | 6-4,6-4 |
| ITF Women Taipei | 2018/07/24 03:55 | Chan, Chin-Wei v Takahata, Kotomi | 4-6,6-3,6-3 |
| ITF Women Astana Qual | 2018/07/14 10:45 | Kruzhkova, Daria v Takahata, Kotomi | 6-2,6-1 |
| ITF Women Tianjin Qual | 2018/07/09 02:00 | Takahata, Kotomi v Mei Xu Wu | 3-6,6-2,2-6 |
| Makinohara, Singles Qualifying W-WITF-JPN-15A | 2018/10/07 03:00 | Haine Ogata v Oshino, Suzuho | 6-1,3-6,2-6 |
| ITF Women Jakarta | 2018/07/19 03:00 | Oshino, Suzuho v Okuno, Ayaka | 3-6,4-6 |
| ITF Women Jakarta | 2018/07/18 03:00 | Takayama, Chihiro v Oshino, Suzuho | 7-6,3-6,2-6 |
| ITF Women Solo | 2018/07/11 02:30 | Oshino, Suzuho v Okuno, Ayaka | 6-7,4-6 |
| ITF Women Solo | 2018/07/10 07:05 | Shaulskaya, Anastasia v Oshino, Suzuho | 5-7,1-6 |
| Kofu, Singles W-WITF-JPN-02A | 2018/06/12 02:25 | Mai Hontama v Oshino, Suzuho | 6-3,6-2 |
| ITF Women Karuizawa Qual | 2018/05/20 02:30 | Mana Kawamura v Oshino, Suzuho | 6-2,6-2 |
| ITF Women Kurume | 2018/05/17 01:00 | Broady, Naomi v Oshino, Suzuho | 6-1,6-4 |