Estádio: Court 3 Round: 26 Ground: Synthetic outdoor
| ITF - Hamamatsu - Feminino | 2018/10/17 04:10 | Riko Sawayanagi v Kisa Yoshioka | 6-1,6-1 |
| ITF - Nanao - Feminino | 2018/08/29 06:40 | Shiho Akita v Riko Sawayanagi | 6-7,6-1,7-5 |
| ITF - Tsukuba - Feminino | 2018/08/21 00:30 | Riko Sawayanagi v Momoko Kobori | 4-6,3-6 |
| ITF - Toyota - Qualificação - Feminino | 2018/03/11 03:30 | Riko Sawayanagi v Mayu Iwai | 6-0,1-6,2-6 |
| ITF - Toyota - Qualificação - Feminino | 2018/03/10 01:00 | Riko Sawayanagi v Himari Sato | 7-5,6-0 |
| ITF - Mildura - Feminino | 2018/03/06 01:05 | Maddison Inglis v Riko Sawayanagi | 6-0,6-2 |
| ITF - Perth - Qualificação | 2018/02/19 05:05 | Riko Sawayanagi v Lulu Sun | 2-6,3-6 |
| ITF - Perth - Qualificação | 2018/02/18 03:00 | Riko Sawayanagi v Ramu Ueda | 6-3,7-5 |
| ITF - Hamamatsu - Feminino | 2018/10/17 05:30 | Ayumi Koshiishi v Miyabi Inoue | 2-6,2-6 |
| WTA - Tóquio | 2018/09/15 07:00 | Zarina Diyas v Miyabi Inoue | 6-4,6-3 |
| ITF - Nanao - Feminino | 2018/08/30 03:00 | Miyabi Inoue v Kyoka Okamura | 2-6,4-6 |
| ITF - Nanao - Feminino | 2018/08/28 03:00 | Miyabi Inoue v Yidi Yang | 6-3,6-2 |
| ITF - Tsukuba - Feminino | 2018/08/21 00:30 | Yuuki Tanaka v Miyabi Inoue | 6-3,6-1 |
| ITF - Guiyang - Feminino | 2018/08/16 02:00 | Yue Yuan v Miyabi Inoue | 4-6,6-2,6-3 |
| ITF - Guiyang - Feminino | 2018/08/14 08:10 | Jiahui Chen v Miyabi Inoue | 2-6,2-6 |
| ITF - Jinan - Feminino | 2018/08/08 02:00 | Miyabi Inoue v Fang Ying Xun | 3-6,2-6 |