Round: 26 Ground: Hardcourt outdoor
| ITF Women Kurume | 2017/05/19 02:10 | Erina Hayashi v Riko Sawayanagi | 6-1,1-6,6-3 |
| ITF Women Kofu | 2017/06/13 01:00 | Erina Hayashi v Kimika Sakata | 6-0,6-0 |
| ITF Women Tokyo | 2017/06/07 04:40 | Akiko Omae v Erina Hayashi | 6-2,6-2 |
| ITF Women Tokyo Qual | 2017/06/05 01:00 | Erina Hayashi v Yuxuan Zhang | 7-5,6-1 |
| ITF Women Tokyo Qual | 2017/06/04 02:15 | Erina Hayashi v Karin Terami | 5-7,6-4,6-2 |
| ITF Women Kurume | 2017/05/20 01:15 | Laura Robson v Erina Hayashi | 7-5,7-6 |
| ITF Women Kurume | 2017/05/19 02:10 | Erina Hayashi v Riko Sawayanagi | 6-1,1-6,6-3 |
| 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 Kofu | 2017/06/14 02:35 | Reina Takahashi v Riko Sawayanagi | 4-6,4-6 |
| French Open Women Qual | 2017/05/23 11:05 | Tereza Martincova v Riko Sawayanagi | 6-4,6-3 |
| ITF Women Kurume | 2017/05/19 02:10 | Erina Hayashi v Riko Sawayanagi | 6-1,1-6,6-3 |
| 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 |