Stadium: Court 2 Round: 54
| ITF Women Braunschweig | 2018/08/22 09:00 | Anastasia Zarycka v Mari Osaka | 6-4,7-5 |
| ITF Women Porto | 2018/07/24 09:30 | Lisa Sabino v Mari Osaka | 6-2,6-1 |
| WTA Bucharest Qual | 2018/07/14 11:15 | Claire Liu v Mari Osaka | 6-0,3-6,6-4 |
| ITF Women Denain | 2018/07/06 09:00 | Aliona Bolsova Zadoinov v Mari Osaka | 6-1,6-4 |
| ITF Women Denain | 2018/07/05 11:05 | Quirine Lemoine v Mari Osaka | 4-6,0-6 |
| ITF Women Denain | 2018/07/04 08:30 | Mari Osaka v Momoko Kobori | 6-1,6-1 |
| ITF Women Perigueux | 2018/06/28 09:00 | Nadia Podoroska v Mari Osaka | 7-6,7-5 |
| ITF Women Perigueux | 2018/06/27 10:05 | Moyuka Uchijima v Mari Osaka | 4-6,6-7 |
| ITF Women Budapest | 2018/08/23 10:10 | Maria Marfutina v Gabriela Pantuckova | 6-2,2-6,6-7 |
| ITF Women Budapest | 2018/08/22 09:40 | Maria Marfutina v Joanna Zawadzka | 7-5,6-3 |
| ITF Women Budapest | 2018/08/21 13:10 | Maria Marfutina v Ingrid Vojcinakova | 7-6,6-2 |
| ITF Women Prague Qual | 2018/07/23 09:55 | Maria Marfutina v Anna Pribylova | 6-1,3-6,6-7 |
| ITF Women Prague Qual | 2018/07/22 10:55 | Maria Marfutina v Katerina Filip | 6-3,6-2 |
| ITF Women Olomouc | 2018/07/18 10:30 | Katerina Stewart v Maria Marfutina | 6-0,6-2 |
| ITF Women Olomouc Qual | 2018/07/16 09:00 | Maria Marfutina v Katerina Filip | 6-2,6-1 |
| ITF Women Olomouc Qual | 2018/07/15 09:50 | Maria Marfutina v Iana Tishchenko | 6-7,6-2,6-1 |