Stadium: Court 13 Round: 25 Ground: Hardcourt outdoor
| Makinohara, Singles Qualifying W-C25-JPN-05A | 2017/10/09 02:10 | Takahashi, Reina v 川崎光美 | 6-3,6-3 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/06/10 00:00 | Takahashi, Reina v 松田美咲 | 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 | ホンドウ,サクラ v Takahashi, Reina | 6-1,5-7,6-1 |
| ITF Women Karuizawa Qual | 2018/05/20 04:00 | ケズカ,チエ v Takahashi, Reina | 6-3,1-6,3-6 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/24 03:00 | Takahashi, Reina v 秋田 史帆 | 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 荒川 春菜 | 1-6,2-6 |
| Kofu, Singles W-WITF-JPN-02A | 2018/06/12 01:00 | タナカ,ユウキ v 川崎光美 | 6-0,6-2 |
| ITF Women Karuizawa Qual | 2018/05/21 01:00 | 川崎光美 v 西郷 里奈 | 1-6,2-6 |
| ITF Women Karuizawa Qual | 2018/05/20 02:30 | 川崎光美 v 秋山みなみ | 6-3,6-3 |
| ITF Women Kurume Qual | 2018/05/14 04:30 | 川崎光美 v アナスタシア・E ネフェドワ | 3-6,2-6 |
| ITF Women Kurume Qual | 2018/05/13 08:40 | 川崎光美 v Sonoda, Ayano | 6-1,6-1 |
| ITF Women Fukuoka Qual | 2018/05/06 04:15 | 川崎光美 v アビー・マイヤーズ | 1-6,2-6 |
| ITF Women Gifu Qual | 2018/04/29 01:00 | 桑田 寛子 v 川崎光美 | 6-0,7-6 |
| ITF Women Osaka Qual | 2018/04/07 01:30 | レベッカ・マリノ v 川崎光美 | 6-1,6-4 |