Stadium: C Round: 54
| ITF Women Charlottesville Qual | 2018/04/23 14:00 | Mari Osaka v Ingrid Neel | 6-7,6-1,6-1 |
| ITF Women Pelham | 2018/04/10 23:30 | Mari Osaka v Barbara Haas | 6-4,6-7,0-6 |
| ITF Women Jackson | 2018/04/04 15:00 | Mari Osaka v Gaia Sanesi | 5-7,4-6 |
| ITF Women Wesley Chapel Qual | 2018/01/23 19:40 | Mari Osaka v Olga Ianchuk | 6-7,4-6 |
| 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 |
| ITF Women Charlottesville Qual | 2018/04/23 14:00 | Alexandra Mueller v Marine Partaud | 4-6,6-4,7-5 |
| ITF Women Charlottesville Qual | 2018/04/22 15:55 | Alexandra Mueller v Catherine Leduc | 7-6,6-2 |
| ITF Women Indian Harbour Qual | 2018/04/09 16:40 | Peyton Stearns v Alexandra Mueller | 5-7,6-3,6-4 |
| ITF Women Indian Harbour Qual | 2018/04/08 18:55 | Alana Smith v Alexandra Mueller | 2-6,4-6 |
| ITF Women Waco Qual | 2017/11/05 18:30 | Aymet Uzcategui v Alexandra Mueller | 4-6,6-2,6-3 |
| ITF Women Macon Qual | 2017/10/22 15:55 | Alexandra Mueller v Sabrina Santamaria | 3-6,2-6 |
| ITF Women Las Vegas Qual | 2017/09/10 21:35 | Alexandra Mueller v Ena Shibahara | 4-6,6-3,2-6 |
| ITF Women Landisville | 2017/08/09 16:50 | Alexandra Mueller v Sherazad Reix | 2-6,3-6 |