Stadium: Court A7 Round: 62 Ground: Synthetic outdoor
| Tsukuba, Singles W-WITF-JPN-09A | 2018/08/19 03:00 | So, Kumi v タカハタ,コトミ | 6-4,6-4 |
| ITF Women Taipei | 2018/07/24 03:55 | Chan, Chin-Wei v タカハタ,コトミ | 4-6,6-3,6-3 |
| ITF Women Astana Qual | 2018/07/14 10:45 | クルズコワ,ダリア v タカハタ,コトミ | 6-2,6-1 |
| ITF Women Tianjin Qual | 2018/07/09 02:00 | タカハタ,コトミ v ウー・メイシュー | 3-6,6-2,2-6 |
| ITF Women Tianjin Qual | 2018/07/08 06:35 | タカハタ,コトミ v ヤン,シアン | 6-0,6-2 |
| ITF Women Daegu | 2018/06/21 01:00 | チャン・スジョン v タカハタ,コトミ | 6-3,7-5 |
| ITF Women Daegu | 2018/06/20 05:45 | タカハタ,コトミ v コイケ,サツキ | 6-4,7-5 |
| ITF Women Daegu Qual | 2018/06/19 01:00 | タカハタ,コトミ v ホン・スンヨン | 6-4,3-6,6-3 |
| Antalya, Singles Qualifying W-WITF-TUR-04A | 2018/06/04 07:30 | Sonoda, Ayano v マリー・メトラウ | 1-6,1-6 |
| Antalya, Singles Qualifying W-WITF-TUR-04A | 2018/05/30 09:10 | Sonoda, Ayano v メリス・セゼル | 0-6,2-6 |
| ITF Women Antalya Qual | 2018/05/28 11:10 | Sonoda, Ayano v Belovukovic, Stephanie | 7-6,1-6,5-7 |
| ITF Women Kurume Qual | 2018/05/13 08:40 | 川崎光美 v Sonoda, Ayano | 6-1,6-1 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/17 01:00 | Sonoda, Ayano v 細木 咲良 | 4-6,4-6 |
| Antalya, Singles Qualifying W-WITF-TUR-04A | 2018/01/27 06:30 | Sonoda, Ayano v 高山千尋 高山千尋 | 0-6,0-6 |
| Antalya, Singles Qualifying W-WITF-TUR-04A | 2018/01/21 11:00 | Sonoda, Ayano v Altukhova, Polina | 2-6,4-6 |
| Antalya, Singles Qualifying W-WITF-TUR-04A | 2018/01/15 08:00 | Sonoda, Ayano v Schippers, Daniela | 2-6,3-6 |