Stadium: Court 1 Round: 25 Ground: Hardcourt outdoor
| ITF Women Tokyo | 2017/11/08 03:20 | Mayo Hibi v Risa Ozaki | 6-1,6-1 |
| ITF Women Pune | 2018/11/26 08:00 | Risa Ozaki v Ekaterina Yashina | 4-6,2-6 |
| ITF Women Norman | 2018/11/14 19:20 | Maria Camila Osorio v Risa Ozaki | 6-4,6-4 |
| ITF Women Shenzhen | 2018/11/04 06:15 | Olga Doroshina v Risa Ozaki | 6-4,3-6,7-6 |
| ITF Women Canberra | 2018/11/02 00:00 | Risa Ozaki v Astra Sharma | 4-6,6-3,0-6 |
| ITF Women Canberra | 2018/10/31 23:00 | Arina Rodionova v Risa Ozaki | 6-4,6-7,3-6 |
| ITF Women Canberra | 2018/10/29 23:00 | Risa Ozaki v Alana Parnaby | 6-3,6-3 |
| ITF Women Bendigo | 2018/10/23 00:45 | Risa Ozaki v Destanee Aiava | 4-6,6-7 |
| ITF Women Brisbane | 2018/10/04 01:30 | Risa Ozaki v Rutuja Bhosale | 1-6,7-5,2-6 |
| WTA Taipei | 2018/11/11 03:45 | Elena-Gabriela Ruse v Mayo Hibi | 7-6,2-6,6-4 |
| WTA Luxembourg | 2018/10/13 16:25 | Kristyna Pliskova v Mayo Hibi | 6-4,6-1 |
| WTA Hong Kong | 2018/10/06 02:00 | Mayo Hibi v Viktoriya Tomova | 2-6,4-6 |
| US Open Women | 2018/08/23 17:20 | Jil Teichmann v Mayo Hibi | 6-4,6-4 |
| US Open Women | 2018/08/21 15:00 | Myrtille Georges v Mayo Hibi | 1-6,2-6 |
| WTA Washington | 2018/07/31 03:00 | Mayo Hibi v Fanny Stollar | 1-6,6-7 |
| WTA Washington Qual | 2018/07/29 17:00 | Sofya Zhuk v Mayo Hibi | 6-3,7-6 |
| WTA Washington Qual | 2018/07/28 18:50 | Natasha Subhash v Mayo Hibi | 0-6,1-6 |