Stadium: Court 4 Round: 54
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/25 02:30 | Okuno, Ayaka v Silich, Alina | 1-6,1-6 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/24 04:00 | Robillard-Millette, Charlotte v Okuno, Ayaka | 1-6,1-6 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/23 01:00 | Okuno, Ayaka v Lee, So-Ra | 3-6,4-6 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/22 03:00 | Chiang, Yuki Kristina v Okuno, Ayaka | 6-1,5-7,1-6 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/20 02:40 | Erina Hayashi v Okuno, Ayaka | 0-6,7-6,3-6 |
| ITF Women Toyota Qual | 2018/03/10 01:00 | Okuno, Ayaka v Kyoka Okamura | 1-6,3-6 |
| Yokohama, Singles Qualifying W-WITF-JPN-01B | 2018/03/04 07:00 | Okuno, Ayaka v Ya-Hsuan Lee | 4-6,4-6 |
| Surprise, Singles Qualifying W-WITF-USA-05A | 2018/02/11 17:00 | Giuliana Olmos v Okuno, Ayaka | 6-2,1-6,6-2 |
| Kofu, Singles W-WITF-JPN-02A | 2018/03/29 01:00 | Luksika Kumkhum v Shiho Akita | 6-3,6-1 |
| Kofu, Singles W-WITF-JPN-02A | 2018/03/28 03:20 | Shiho Akita v Lykina, Ksenia | 7-6,4-6,6-3 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/26 01:00 | Hasegawa, Mami v Shiho Akita | 2-6,0-6 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/25 02:30 | Yui Chikaraishi v Shiho Akita | 1-6,1-6 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/24 03:00 | Reina Takahashi v Shiho Akita | 4-6,1-6 |
| Toyota, Singles W-WITF-JPN-02A | 2018/03/14 04:00 | Shiho Akita v Harriet Dart | 4-6,2-6 |
| ITF Women Toyota Qual | 2018/03/12 02:45 | Shiho Akita v Kim, Na Ri | 6-3,6-2 |
| ITF Women Toyota Qual | 2018/03/11 03:30 | Shiho Akita v Mei Yamaguchi | 6-3,6-1 |