Stadium: Court B2 Round: 25 Ground: Hardcourt outdoor
| ITF Women Noto | 2016/09/02 01:00 | Momoko Kobori v Riko Sawayanagi | 6-4,6-2 |
| ITF Women Toyota Qual | 2018/03/11 03:30 | Riko Sawayanagi v Mayu Iwai | 6-0,1-6,2-6 |
| ITF Women Toyota Qual | 2018/03/10 01:00 | Riko Sawayanagi v Himari Sato | 7-5,6-0 |
| ITF Women Mildura | 2018/03/06 01:05 | Maddison Inglis v Riko Sawayanagi | 6-0,6-2 |
| ITF Women Perth Qual | 2018/02/19 05:05 | Riko Sawayanagi v Lulu Sun | 2-6,3-6 |
| ITF Women Perth Qual | 2018/02/18 03:00 | Riko Sawayanagi v Ramu Ueda | 6-3,7-5 |
| ITF Women Perth | 2018/02/15 02:00 | Riko Sawayanagi v Mai Minokoshi | 1-6,1-6 |
| ITF Women Perth Qual | 2018/02/12 04:35 | Riko Sawayanagi v Maryna Chernyshova | 6-4,6-2 |
| ITF Women Perth Qual | 2018/02/11 02:00 | Riko Sawayanagi v Elizabeth James | 6-1,6-1 |
| WTA Nanchang | 2018/07/23 09:00 | Momoko Kobori v Fang Ying Xun | 6-7,0-6 |
| WTA Nanchang Qual | 2018/07/22 11:00 | Momoko Kobori v Shilin Xu | 6-4,2-6,4-6 |
| WTA Nanchang Qual | 2018/07/21 10:35 | Momoko Kobori v Qianhui Tang | 6-4,6-2 |
| ITF Women Contrexeville | 2018/07/11 09:30 | Ysaline Bonaventure v Momoko Kobori | 6-3,7-6 |
| ITF Women Denain | 2018/07/04 08:30 | Mari Osaka v Momoko Kobori | 6-1,6-1 |
| ITF Women Perigueux | 2018/06/25 09:30 | Momoko Kobori v Cristina Bucsa | 1-6,3-6 |
| ITF Women Montpellier | 2018/06/19 12:30 | Momoko Kobori v Nathaly Kurata | 7-6,3-6,5-7 |
| ITF Women Kofu | 2018/06/15 04:30 | Misaki Doi v Momoko Kobori | 6-4,7-5 |