Stadium: Court 10 Round: 25 Ground: Clay
| ITF Women Denain | 2017/07/06 12:05 | Olga Ianchuk v Mari Osaka | 0-6,6-7 |
| ITF Women Orlando Qual | 2018/01/14 15:00 | Mari Osaka v Caitlin Whoriskey | 3-6,6-7 |
| ITF Women Daytona Beach | 2018/01/12 15:00 | Mari Osaka v Grace Min | 6-7,4-6 |
| ITF Women Daytona Beach | 2018/01/11 16:30 | Elena-Gabriela Ruse v Mari Osaka | 6-7,3-6 |
| ITF Women Daytona Beach | 2018/01/11 01:05 | Mari Osaka v Kyoka Okamura | 6-1,6-1 |
| WTA Honolulu Qual | 2017/11/19 22:45 | Mari Osaka v Haruka Kaji | 3-6,5-7 |
| WTA Limoges Qual | 2017/11/05 12:00 | Mari Osaka v Olga Saez Larra | 6-1,3-6,6-7 |
| WTA Limoges Qual | 2017/11/04 13:35 | Silvia Soler-Espinosa v Mari Osaka | 3-6,7-6,4-6 |
| ITF Women Nantes | 2017/11/01 15:10 | Kaia Kanepi v Mari Osaka | 2-6,7-6,6-0 |
| ITF Women Orlando | 2018/01/17 18:15 | Olga Ianchuk v Maria Sanchez | 3-6,5-7 |
| ITF Women Zawada | 2017/11/17 14:10 | Olga Ianchuk v Deborah Chiesa | 3-6,6-7 |
| ITF Women Zawada | 2017/11/16 10:30 | Olga Ianchuk v Jesika Maleckova | 5-7,6-3,6-2 |
| ITF Women Zawada | 2017/11/15 10:00 | Olga Ianchuk v Weronika Jasmina Forys | 7-6,7-6 |
| ITF Women Nantes | 2017/11/04 13:30 | Richel Hogenkamp v Olga Ianchuk | 6-4,6-4 |
| ITF Women Nantes | 2017/11/03 11:30 | Olga Ianchuk v Conny Perrin | 6-1,6-2 |
| ITF Women Nantes Qual | 2017/11/02 11:30 | Lesley Pattinama Kerkhove v Olga Ianchuk | 5-7,4-6 |
| ITF Women Nantes Qual | 2017/11/01 10:30 | Olga Ianchuk v Irina Ramialison | 7-6,0-6,6-4 |