Stadium: Court 1 Round: 25
| ITF Women Brussels Qual | 2018/07/14 09:00 | Mary Closs v Kristy Jorgensen | 6-2,1-6,2-6 |
| ITF Women Knokke | 2018/07/09 08:00 | Mary Closs v Anna Kubareva | 6-7,1-6 |
| ITF Women Baton Rouge Qual | 2018/06/17 14:00 | Connie Ma v Mary Closs | 6-2,7-5 |
| ITF Women Sumter Qual | 2018/06/10 13:00 | Abigail Forbes v Mary Closs | 6-3,6-3 |
| ITF Women Bethany Beach Qual | 2018/06/04 14:00 | Maegan Manasse v Mary Closs | 6-4,1-6,6-1 |
| ITF Women Osprey Qual | 2018/05/21 14:00 | Ksenia Laskutova v Mary Closs | 6-1,6-1 |
| ITF Women Charlottesville Qual | 2018/04/22 18:05 | Mary Closs v Marine Partaud | 2-6,2-6 |
| ITF Women Dothan Qual | 2018/04/15 20:50 | Katherine Sebov v Mary Closs | 6-2,6-3 |