Round: 26 Ground: Hardcourt indoor
| Challenger - Las Vegas - HD | 2021/10/27 19:25 | Kozlov/Polansky v Galloway/Lawson | 4-6,6-7 |
| Challenger - Columbus - HD | 2021/09/25 20:25 | Kozlov/Polansky v Lutschaunig/Trotter | 7-5,7-6 |
| Challenger - Columbus - HD | 2021/09/24 22:25 | Galloway/Lawson v Kozlov/Polansky | 5-7,6-3,2-10 |
| Challenger - Columbus - HD | 2021/09/23 20:45 | Nam/Song v Kozlov/Polansky | 3-6,7-6,6-10 |
| Challenger - Columbus - HD | 2021/09/22 00:30 | Brouwer/Stalder v Kozlov/Polansky | 5-7,6-4,7-10 |
| Challenger - Cary - HD | 2021/09/18 19:45 | Blumberg/Schnur v Kozlov/Polansky | 6-4,1-6,10-4 |
| Challenger - Cary - HD | 2021/09/17 22:35 | Kozlov/Polansky v Jung/Krueger | 6-7,7-5,10-4 |
| Challenger - Cary - HD | 2021/09/16 18:30 | Aragone/Barrientos v Kozlov/Polansky | 4-6,4-6 |