Stadium: Court 14 Round: 25
| ITF Women Daegu Qual | 2018/06/18 03:30 | Kotomi Takahata v Yu Jin Ahn | 6-1,6-4 |
| ITF Women Daegu Qual | 2018/06/17 04:30 | Da Ye Kim v Yu Jin Ahn | 6-0,5-7,3-6 |
| ITF Women Sangju | 2018/06/05 03:50 | Aiko Yoshitomi v Yu Jin Ahn | 6-1,6-1 |
| ITF Women Changwon Qual | 2018/05/20 02:00 | Yu Jin Ahn v Da Hye Kim | 2-6,7-5,0-6 |
| ITF Women Incheon Qual | 2018/05/14 02:00 | Ya-Hsuan Lee v Yu Jin Ahn | 6-3,6-1 |
| ITF Women Incheon Qual | 2018/05/13 01:00 | You-Na Sul v Yu Jin Ahn | 4-6,3-6 |
| ITF Women Goyang Qual | 2018/05/08 01:00 | Yu Jin Ahn v Seo-Kyung Kang | 4-6,2-6 |
| ITF Women Goyang Qual | 2018/05/07 00:30 | Maddison Inglis v Yu Jin Ahn | 4-6,5-7 |
| ITF Women Fort Worth | 2018/07/31 17:20 | Dominique Schaefer v Ayaka Okuno | 6-4,6-3 |
| ITF Women Evansville | 2018/07/25 18:25 | Ayaka Okuno v Priyanka Shah | 6-7,1-6 |
| ITF Women Jakarta | 2018/07/20 02:00 | Zeel Desai v Ayaka Okuno | 6-2,7-6 |
| ITF Women Jakarta | 2018/07/19 03:00 | Suzuho Oshino v Ayaka Okuno | 3-6,4-6 |
| ITF Women Jakarta | 2018/07/18 03:00 | Ani Vangelova v Ayaka Okuno | 1-6,1-6 |
| ITF Women Solo | 2018/07/12 03:00 | Mana Ayukawa v Ayaka Okuno | 6-0,4-6,6-3 |
| ITF Women Solo | 2018/07/11 02:30 | Suzuho Oshino v Ayaka Okuno | 6-7,4-6 |
| ITF Women Solo | 2018/07/10 07:20 | Snehal Mane v Ayaka Okuno | 1-6,4-6 |