Stadium: C Round: 27
| ITF Women Florence | 2018/10/18 14:00 | Ulrikke Eikeri v Osaka, Mari | 1-6,3-6 |
| ITF Women Florence | 2018/10/16 17:55 | Gleason, Quinn v Osaka, Mari | 1-6,6-7 |
| ITF Women Stockton | 2018/10/04 22:30 | Osaka, Mari v Robin Anderson | 5-7,4-6 |
| ITF Women Stockton | 2018/10/03 20:55 | Osaka, Mari v Sanchez, Maria | 6-1,6-3 |
| WTA Tokyo | 2018/09/15 01:00 | Osaka, Mari v Lottner, Antonia | 3-6,6-4,3-6 |
| ITF Women Montreux | 2018/09/07 13:00 | Zimmermann, Kimberley v Osaka, Mari | 7-5,6-4 |
| ITF Women Montreux | 2018/09/06 08:00 | Osaka, Mari v Martina Trevisan | 6-3,6-2 |
| ITF Women Montreux | 2018/09/04 09:30 | Osaka, Mari v Kilnarova, Monika | 6-2,6-1 |
| ITF Women Florence | 2018/10/18 16:00 | Goncalves, Paula Cristina v Kayla Day | 6-4,6-4 |
| ITF Women Florence | 2018/10/17 15:15 | Goncalves, Paula Cristina v Kukharchuk, Nika | 6-0,6-1 |
| ITF Women Florence | 2018/10/16 16:50 | Goncalves, Paula Cristina v Garcia, Alice | 6-2,6-4 |
| ITF Women Florence | 2018/10/15 15:30 | Goncalves, Paula Cristina v Uzcategui, Aymet | 6-2,6-1 |
| ITF Women Florence | 2018/10/14 17:00 | Goncalves, Paula Cristina v Vivian Mayumi Toma | 6-0,6-0 |
| ITF Women Stockton | 2018/10/01 18:25 | Marand, Sanaz v Goncalves, Paula Cristina | 6-2,6-4 |
| ITF Women Stockton | 2018/09/30 22:05 | Schaefer, Dominique v Goncalves, Paula Cristina | 4-6,0-6 |
| Templeton, Singles W-WITF-USA-32A | 2018/09/23 19:40 | Goncalves, Paula Cristina v Montez, Pamela | 4-6,7-5,1-6 |