Stadium: Court 13 Round: 25 Ground: Hardcourt outdoor
| Makinohara, Singles Qualifying W-C25-JPN-05A | 2017/10/09 02:10 | Takahashi, Reina v Kawasaki, Mitsumi | 6-3,6-3 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/06/10 00:00 | Takahashi, Reina v 마츠다 M , 미사키 | 6-7,1-6 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/06/09 04:00 | Takahashi, Reina v Nishida, Nao | 6-2,6-3 |
| ITF Women Karuizawa Qual | 2018/05/21 02:40 | 혼도, 사쿠라 v Takahashi, Reina | 6-1,5-7,6-1 |
| ITF Women Karuizawa Qual | 2018/05/20 04:00 | 케즈카, 치에 v Takahashi, Reina | 6-3,1-6,3-6 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/24 03:00 | Takahashi, Reina v 아키타, 시호 | 4-6,1-6 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/21 05:35 | Takahashi, Reina v Fujiwara, Rika | 6-7,7-6,3-6 |
| ITF Women Toyota Qual | 2018/03/10 01:00 | Itaya, Rion v Takahashi, Reina | 6-3,6-4 |
| Tokyo, Singles Qualifying W-C100-JPN-01A | 2017/11/05 03:00 | Takahashi, Reina v 아라카와 H, 하루나 | 1-6,2-6 |
| Kofu, Singles W-WITF-JPN-02A | 2018/06/12 01:00 | 타나카, 유우키 v Kawasaki, Mitsumi | 6-0,6-2 |
| ITF Women Karuizawa Qual | 2018/05/21 01:00 | Kawasaki, Mitsumi v 사이고, 리나 | 1-6,2-6 |
| ITF Women Karuizawa Qual | 2018/05/20 02:30 | Kawasaki, Mitsumi v 아키야마, 미나미 | 6-3,6-3 |
| ITF Women Kurume Qual | 2018/05/14 04:30 | Kawasaki, Mitsumi v 네페도바, 아나스타시아 에브게니에브나 (USA) | 3-6,2-6 |
| ITF Women Kurume Qual | 2018/05/13 08:40 | Kawasaki, Mitsumi v Sonoda, Ayano | 6-1,6-1 |
| ITF Women Fukuoka Qual | 2018/05/06 04:15 | Kawasaki, Mitsumi v 마이어스, 아비 | 1-6,2-6 |
| ITF Women Gifu Qual | 2018/04/29 01:00 | 쿠와타, 히로코 v Kawasaki, Mitsumi | 6-0,7-6 |
| ITF Women Osaka Qual | 2018/04/07 01:30 | 마리노, 레베카 v Kawasaki, Mitsumi | 6-1,6-4 |