Stadium: Court 5 Round: 54 Ground: Hardcourt outdoor
| ITF Women Kyoto | 2017/09/05 06:55 | Okuno, Ayaka v Mei Yamaguchi | 4-6,2-6 |
| ITF W25 Hamamatsu | 2019/10/14 01:00 | Okuno, Ayaka v Shigeta, Mua | 3-6,5-7 |
| ITF W25 Makinohara | 2019/10/08 00:30 | Okuno, Ayaka v Koike, Satsuki | 5-7,6-3,6-10 |
| Anning, Singles W-ITF-CHN-22A | 2019/09/26 02:00 | Okuno, Ayaka v Wushuang Zheng | 2-6,1-6 |
| Anning, Singles W-ITF-CHN-22A | 2019/09/25 03:20 | Zhu, Wanning v Okuno, Ayaka | 3-6,2-6 |
| Anning, Singles W-ITF-CHN-22A | 2019/09/18 05:00 | Okuno, Ayaka v Lu, Jiaxi | 2-6,4-6 |
| Anning, Singles W-ITF-CHN-22A | 2019/09/12 03:40 | Liu, SI Qi v Okuno, Ayaka | 2-6,3-6 |
| Anning, Singles W-ITF-CHN-22A | 2019/09/10 02:30 | Okuno, Ayaka v Jiaying He | 6-2,6-4 |
| Changsha, Simples W-ITF-CHN-19A | 2019/09/03 02:00 | Jessy Rompies v Okuno, Ayaka | 6-3,6-2 |
| ITF W25 Hamamatsu | 2019/10/19 02:30 | Mei Yamaguchi v Hozumi, Eri | 2-6,1-6 |
| ITF W25 Hamamatsu | 2019/10/18 04:30 | Mei Yamaguchi v Akiko Omae | 5-7,6-1,7-6 |
| ITF W25 Hamamatsu | 2019/10/16 05:20 | Mai Hontama v Mei Yamaguchi | 3-6,6-3,5-7 |
| ITF W25 Makinohara | 2019/10/09 00:30 | Funa Kozaki v Mei Yamaguchi | 6-3,7-5 |
| Hua Hin, Simples W-ITF-THA-10A | 2019/07/12 03:00 | Brouleau, Lou v Mei Yamaguchi | 5-7,6-3,7-6 |
| Hua Hin, Simples W-ITF-THA-10A | 2019/07/11 03:00 | Feder, Ambre v Mei Yamaguchi | 1-6,2-6 |
| Hua Hin, Simples W-ITF-THA-10A | 2019/07/10 03:00 | Lunda Kumhom v Mei Yamaguchi | 5-7,2-6 |
| Hua Hin, Simples W-ITF-THA-10A | 2019/07/05 04:30 | Brouleau, Lou v Mei Yamaguchi | 6-3,6-3 |