Round: 27
| ITF Women Kurume | 2017/05/18 01:00 | Sari Baba v Erina Hayashi | 6-2,4-6,4-6 |
| ITF Women Kurume | 2017/05/17 01:00 | Ayaka Okuno v Erina Hayashi | 6-7,0-6 |
| ITF Women Kurume Qual | 2017/05/15 01:30 | Erina Hayashi v Mei Yamaguchi | 6-4,6-1 |
| ITF Women Kurume Qual | 2017/05/14 08:15 | Erina Hayashi v Ramu Ueda | 6-3,6-4 |
| ITF Women Kurume Qual | 2017/05/14 05:15 | Erina Hayashi v Misaki Matsuda | 6-2,6-1 |
| ITF Women Fukuoka | 2017/05/11 01:00 | Erina Hayashi v Zarina Diyas | 1-6,3-6 |
| ITF Women Fukuoka | 2017/05/10 01:00 | Ayaka Okuno v Erina Hayashi | 3-6,3-6 |
| ITF Women Fukuoka Qual | 2017/05/08 01:00 | Olivia Tjandramulia v Erina Hayashi | 3-6,1-6 |
| ITF Women Kurume | 2017/05/18 02:25 | Olivia Tjandramulia v Riko Sawayanagi | 6-4,0-6,3-6 |
| ITF Women Kurume | 2017/05/16 03:05 | Mihoki Miyahara v Riko Sawayanagi | 3-6,3-6 |
| ITF Women Fukuoka | 2017/05/11 01:00 | Varatchaya Wongteanchai v Riko Sawayanagi | 7-5,6-4 |
| ITF Women Fukuoka | 2017/05/10 03:55 | Yukina Saigo v Riko Sawayanagi | 0-6,6-4,2-6 |
| ITF Women Gifu | 2017/05/03 01:00 | Riko Sawayanagi v Arina Rodionova | 6-2,3-6,5-7 |
| WTA Zhengzhou | 2017/04/19 06:20 | Shuai Peng v Riko Sawayanagi | 6-1,6-4 |
| WTA Zhengzhou | 2017/04/18 05:55 | Miyu Kato v Riko Sawayanagi | 6-7,0-6 |
| ITF Women Nanning | 2017/04/11 05:30 | Riko Sawayanagi v Qianhui Tang | 1-6,5-7 |