Stadium: C Round: 54
| ITF Women Charlottesville Qual | 2018/04/23 14:00 | Osaka, Mari v Neel, Ingrid | 6-7,6-1,6-1 |
| ITF Women Pelham | 2018/04/10 23:30 | Osaka, Mari v Haas, Barbara | 6-4,6-7,0-6 |
| Jackson, Singles W-WITF-USA-09A | 2018/04/04 15:00 | Osaka, Mari v Sanesi, Gaia | 5-7,4-6 |
| Wesley Chapel, Singles Qualifying W-WITF-USA-03A | 2018/01/23 19:40 | Osaka, Mari v Ianchuk, Olga | 6-7,4-6 |
| ITF Women Orlando Qual | 2018/01/14 15:00 | Osaka, Mari v Whoriskey, Caitlin | 3-6,6-7 |
| ITF Women Daytona Beach | 2018/01/12 15:00 | Osaka, Mari v Grace Min | 6-7,4-6 |
| ITF Women Daytona Beach | 2018/01/11 16:30 | Elena-Gabriela Ruse v Osaka, Mari | 6-7,3-6 |
| ITF Women Daytona Beach | 2018/01/11 01:05 | Osaka, Mari v Kyoka Okamura | 6-1,6-1 |
| ITF Women Charlottesville Qual | 2018/04/23 14:00 | Mueller, Alexandra v Marine Partaud | 4-6,6-4,7-5 |
| ITF Women Charlottesville Qual | 2018/04/22 15:55 | Mueller, Alexandra v Leduc, Catherine | 7-6,6-2 |
| ITF Women Indian Harbour Qual | 2018/04/09 16:40 | Peyton Stearns v Mueller, Alexandra | 5-7,6-3,6-4 |
| ITF Women Indian Harbour Qual | 2018/04/08 18:55 | Alana Smith v Mueller, Alexandra | 2-6,4-6 |
| ITF Women Waco Qual | 2017/11/05 18:30 | Uzcategui, Aymet v Mueller, Alexandra | 4-6,6-2,6-3 |
| ITF Women Macon Qual | 2017/10/22 15:55 | Mueller, Alexandra v Sabrina Santamaria | 3-6,2-6 |
| ITF Women Las Vegas Qual | 2017/09/10 21:35 | Mueller, Alexandra v Ena Shibahara | 4-6,6-3,2-6 |
| ITF Women Landisville | 2017/08/09 16:50 | Mueller, Alexandra v Reix, Sherazad | 2-6,3-6 |