| UTR Pro Tennis Series Florida | 2021/12/17 17:30 | Kotzen, Alexander v Francois Musitelli | 6-3,5-2 |
| UTR Pro Tennis Series Florida | 2021/12/16 15:30 | Kotzen, Alexander v Oskar Brostrom Poulsen | 6-3,6-0 |
| UTR Pro Tennis Series Florida | 2021/12/15 18:45 | Connor Krug v Kotzen, Alexander | 6-3,3-6,2-6 |
| UTR Pro Tennis Series Florida | 2021/12/14 14:00 | Leote Prata, Martim v Kotzen, Alexander | 7-6,3-6,5-7 |
| ITF M15 Champaign | 2021/09/16 15:00 | Kotzen, Alexander v Cannon Kingsley | 4-6,3-6 |
| ITF M15 Champaign | 2021/09/15 19:50 | Kotzen, Alexander v Horve, Lucas | 6-2,6-3 |
| ITF M25 Koksijde | 2021/08/17 08:00 | Rojas, O. v Kotzen, Alexander | 6-4,6-3 |
| ITF M15 Gdynia | 2021/08/10 08:00 | Kotzen, Alexander v Olaf Pieczkowski | 2-6,6-2,8-10 |
| UTR Pro Tennis Series Florida | 2021/12/17 14:00 | Adam Walton v Presley Thieneman | 6-0,6-3 |
| UTR Pro Tennis Series Florida | 2021/12/16 17:30 | Adam Walton v Juan David Velasquez | 6-1,6-1 |
| UTR Pro Tennis Series Florida | 2021/12/15 14:00 | Noah Schachter v Adam Walton | 5-7,3-6 |
| UTR Pro Tennis Series Florida | 2021/12/14 18:05 | Zapp, Logan v Adam Walton | 1-6,1-6 |
| Challenger Knoxville | 2021/11/09 16:25 | Adam Walton v Daniel Altmaier | 3-6,2-6 |
| ITF M15 Champaign | 2021/09/15 21:35 | Adam Walton v Zink, Tyler | 3-6,6-7 |
| UTR Pro Tennis Series Florida | 2021/06/06 13:00 | Adam Walton v Ben Shelton | 7-5,6-3 |
| UTR Pro Tennis Series Florida | 2021/06/05 12:00 | Adam Walton v Joao Ceolin | 6-3,6-2 |