Stadium: Court 2 Round: 25
| ITF Women Hong Kong | 2018/07/12 02:00 | Eudice Chong v Reina Takahashi | 7-5,6-4 |
| ITF Women Hong Kong | 2018/07/09 05:55 | Reina Takahashi v Kawasaki, Mitsumi | 6-0,7-5 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/06/10 00:00 | Reina Takahashi v Misaki Matsuda | 6-7,1-6 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/06/09 04:00 | Reina Takahashi v Nishida, Nao | 6-2,6-3 |
| ITF Women Karuizawa Qual | 2018/05/21 02:40 | Hondo, Sakura v Reina Takahashi | 6-1,5-7,6-1 |
| ITF Women Karuizawa Qual | 2018/05/20 04:00 | Kezuka, Chie v Reina Takahashi | 6-3,1-6,3-6 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/24 03:00 | Reina Takahashi v Shiho Akita | 4-6,1-6 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/21 05:35 | Reina Takahashi v Fujiwara, Rika | 6-7,7-6,3-6 |
| ITF Women Gimcheon | 2018/08/23 02:20 | Sul, You-Na v Natarajan, Ramya | 6-7,6-7 |
| ITF Women Gimcheon | 2018/08/22 01:00 | Gabueva, Angelina v Sul, You-Na | 5-7,6-7 |
| ITF Women Gimcheon | 2018/08/21 02:00 | Nicole Khirin v Sul, You-Na | 1-6,0-6 |
| ITF Women Gimcheon | 2018/08/20 02:00 | Jang, Eun SE v Sul, You-Na | 1-6,7-6,4-6 |
| ITF Women Gimcheon | 2018/08/14 01:00 | Emily Appleton v Sul, You-Na | 6-2,6-2 |
| ITF Women Daegu Qual | 2018/06/18 02:00 | Sul, You-Na v Jeong, Yeong Won | 3-6,1-6 |
| ITF Women Daegu Qual | 2018/06/17 02:00 | Sul, You-Na v Lee, Seunghyun | 6-3,6-1 |
| ITF Women Gyeongsan Qual | 2018/06/12 01:00 | Bizhukova, Fatima v Sul, You-Na | 6-1,6-0 |