Stadium: Court 1 Round: 28 Ground: Hardcourt outdoor
| ITF W25 Evansville | 2021/07/17 16:00 | Rebecca Marino v Ellie Douglas | 6-4,6-1 |
| ITF W25 Naples | 2021/11/17 17:30 | Kristina Dmitruk v Ellie Douglas | 7-5,7-6 |
| ITF W25 Daytona Beach | 2021/11/10 14:30 | Moyuka Uchijima v Ellie Douglas | 6-4,6-3 |
| WTA Midland | 2021/11/02 15:00 | Francesca Di Lorenzo v Ellie Douglas | 6-4,4-6,6-4 |
| WTA Midland | 2021/11/01 15:00 | Katherine Sebov v Ellie Douglas | 2-6,3-6 |
| WTA Midland | 2021/10/31 17:10 | Ellie Douglas v Peangtarn Plipuech | 6-3,6-2 |
| ITF W80 Tyler | 2021/10/27 18:00 | Na-Lae Han v Ellie Douglas | 6-1,7-5 |
| ITF W80 Tyler | 2021/10/26 15:00 | Ellie Douglas v Anhzelika Isaeva | 6-4,7-5 |
| ITF W80 Tyler | 2021/10/25 17:15 | Ellie Douglas v Chloe Henderson | 6-1,6-3 |
| Billie Jean King Cup | 2021/11/02 10:45 | Anastasia Pavlyuchenkova v Rebecca Marino | 6-4,4-6,6-2 |
| Billie Jean King Cup | 2021/11/01 12:25 | Alize Cornet v Rebecca Marino | 6-4,7-6 |
| ITF W80 Macon | 2021/10/20 19:00 | Rebecca Marino v Katie Volynets | 3-6,6-2,2-6 |
| ITF W60 Rancho Santa Fe | 2021/10/14 16:55 | Madison Brengle v Rebecca Marino | 6-1,6-2 |
| ITF W60 Rancho Santa Fe | 2021/10/13 18:45 | Rebecca Marino v Maddison Inglis | 6-4,6-3 |
| WTA Indian Wells | 2021/10/05 18:00 | Magdalena Frech v Rebecca Marino | 6-3,4-6,6-3 |
| WTA Indian Wells | 2021/10/04 18:00 | Francesca Di Lorenzo v Rebecca Marino | 1-6,2-6 |
| WTA Chicago | 2021/09/26 18:05 | Kirsten Flipkens v Rebecca Marino | 6-4,6-7,6-4 |