Stadium: C Round: 27
| ITF Women Florence | 2018/10/18 14:00 | Ulrikke Eikeri v Mari Osaka | 1-6,3-6 |
| ITF Women Florence | 2018/10/16 17:55 | Quinn Gleason v Mari Osaka | 1-6,6-7 |
| ITF Women Stockton | 2018/10/04 22:30 | Mari Osaka v Robin Anderson | 5-7,4-6 |
| ITF Women Stockton | 2018/10/03 20:55 | Mari Osaka v Maria Sanchez | 6-1,6-3 |
| WTA - Tokyo | 2018/09/15 01:00 | Mari Osaka v Antonia Lottner | 3-6,6-4,3-6 |
| ITF Women Montreux | 2018/09/07 13:00 | Kimberley Zimmermann v Mari Osaka | 7-5,6-4 |
| ITF Women Montreux | 2018/09/06 08:00 | Mari Osaka v Martina Trevisan | 6-3,6-2 |
| ITF Women Montreux | 2018/09/04 09:30 | Mari Osaka v Monika Kilnarova | 6-2,6-1 |
| ITF Women Florence | 2018/10/18 16:00 | Paula Cristina Goncalves v Kayla Day | 6-4,6-4 |
| ITF Women Florence | 2018/10/17 15:15 | Paula Cristina Goncalves v Nika Kukharchuk | 6-0,6-1 |
| ITF Women Florence | 2018/10/16 16:50 | Paula Cristina Goncalves v Alice Garcia | 6-2,6-4 |
| ITF Women Florence | 2018/10/15 15:30 | Paula Cristina Goncalves v Aymet Uzcategui | 6-2,6-1 |
| ITF Women Florence | 2018/10/14 17:00 | Paula Cristina Goncalves v Vivian Mayumi Toma | 6-0,6-0 |
| ITF Women Stockton | 2018/10/01 18:25 | Sanaz Marand v Paula Cristina Goncalves | 6-2,6-4 |
| ITF Women Stockton | 2018/09/30 22:05 | Dominique Schaefer v Paula Cristina Goncalves | 4-6,0-6 |
| ITF Women Templeton | 2018/09/23 19:40 | Paula Cristina Goncalves v Pamela Montez | 4-6,7-5,1-6 |