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 W25 Singapore | 2019/01/21 02:00 | Risa Ozaki v Aldila Sutjiadi | 2-6,6-4,4-10 |
| ITF W25 Singapore | 2019/01/15 02:00 | Cagla Buyukakcay v Risa Ozaki | 7-6,6-0 |
| ITF W25 Hong Kong | 2019/01/11 02:00 | Shuyue Ma v Risa Ozaki | 7-6,7-5 |
| ITF W25 Hong Kong | 2019/01/10 02:00 | Risa Ozaki v Fatma Al Nabhani | 3-6,6-3,6-4 |
| ITF W25 Hong Kong | 2019/01/09 02:30 | Olivia Tjandramulia v Risa Ozaki | 4-6,2-6 |
| ITF W25 Hong Kong | 2019/01/03 02:00 | Risa Ozaki v En Shuo Liang | 4-6,3-6 |
| ITF W25 Hong Kong | 2019/01/02 05:30 | Jacqueline Cabaj Awad v Risa Ozaki | 2-6,7-5,1-6 |
| ITF Women Pune | 2018/11/26 08:00 | Risa Ozaki v Ekaterina Yashina | 4-6,2-6 |
| ITF W100 Midland | 2019/01/29 19:00 | Mayo Hibi v Marie Bouzkova | 7-5,2-6,3-6 |
| WTA Newport Beach | 2019/01/23 18:00 | Mayo Hibi v Claire Liu | 2-6,1-6 |
| WTA Newport Beach | 2019/01/21 21:55 | Anna Danilina v Mayo Hibi | 4-6,4-6 |
| 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 |