Stadium: Court 6 Round: 54
| ITF Women Tsukuba Qual | 2017/08/20 00:30 | Miyahara, Mihoki v Nishimoto, Megumi | 1-6,0-6 |
| ITF Women Kurume Qual | 2018/05/13 05:55 | Miyahara, Mihoki v Aratake, Meina | 6-1,6-1 |
| ITF Women Fukuoka Qual | 2018/05/06 05:25 | Hosonuma, Chisa v Miyahara, Mihoki | 6-1,7-6 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/18 01:00 | Kezuka, Chie v Miyahara, Mihoki | 6-2,6-2 |
| ITF Women Hong Kong | 2017/12/24 02:00 | Aldila Sutjiadi v Miyahara, Mihoki | 6-1,6-2 |
| ITF Women Hong Kong | 2017/12/23 04:00 | Lam, Wing Kiu Jacqueline v Miyahara, Mihoki | 4-6,1-6 |
| ITF Women Tokyo Qual | 2017/11/04 01:00 | Eri Shimizu v Miyahara, Mihoki | 6-2,6-0 |
| ITF Women Hamamatsu Qual | 2017/10/16 02:00 | Itaya, Rion v Miyahara, Mihoki | 6-3,6-4 |
| ITF Women Makinohara Qual | 2017/10/08 00:30 | Yuka Hosoki v Miyahara, Mihoki | 4-6,6-4,6-3 |
| ITF Women Kurume Qual | 2018/05/13 09:10 | Kusano, Kyoka v Nishimoto, Megumi | 0-6,0-6 |
| ITF Women Fukuoka Qual | 2018/05/06 01:00 | Kajitani, Robu v Nishimoto, Megumi | 6-4,6-2 |
| ITF Women Osaka Qual | 2018/04/07 01:30 | Chihiro Muramatsu v Nishimoto, Megumi | 6-1,6-1 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/24 00:30 | Medcalf, Anne-Marie v Nishimoto, Megumi | 7-6,3-6,7-5 |
| ITF Women Toyota Qual | 2018/03/10 03:00 | Nishimoto, Megumi v Kim, Na Ri | 6-1,5-7,4-6 |
| Yokohama, Singles W-WITF-JPN-01B | 2018/03/08 01:00 | Harriet Dart v Nishimoto, Megumi | 6-3,7-5 |
| Yokohama, Singles W-WITF-JPN-01B | 2018/03/07 04:25 | Nishimoto, Megumi v Brescia, Georgia | 6-4,4-6,7-5 |
| ITF Women Hong Kong | 2017/12/25 02:00 | Chiang, Yuki Kristina v Nishimoto, Megumi | 6-0,0-6,7-5 |