| Flórida - UTR Pro Tennis Series | 2021/12/14 14:00 | Connor Krug v Oskar Brostrom Poulsen | 7-5,6-7,5-1 |
| Flórida - UTR Pro Tennis Series | 2021/12/13 14:00 | Connor Krug v Martim L Prata | 6-3,3-6,3-6 |
| UTR Pro Tennis Series - Atlanta | 2021/07/08 14:30 | Jacob Bickersteth v Connor Krug | 6-2,6-3 |
| UTR Pro Tennis Series - Atlanta | 2021/07/07 12:00 | Connor Krug v William Cooksey | 2-6,6-7 |
| UTR Pro Tennis Series - Atlanta | 2021/07/06 13:30 | Connor Krug v Dane Sweeny | 3-6,1-5 |
| UTR Pro Tennis Series - Atlanta | 2021/07/04 13:30 | John Bernard v Connor Krug | 3-6,6-3,2-6 |
| UTR Pro Tennis Series - Atlanta | 2021/04/10 14:00 | Connor Krug v Adit Sinha | 5-7,1-5 |
| UTR Pro Tennis Series - Atlanta | 2021/04/08 14:00 | Connor Krug v Hunter Reese | 2-6,4-6 |
| Flórida - UTR Pro Tennis Series | 2021/12/14 14:00 | Martim L Prata v Alexander Kotzen | 7-6,3-6,5-7 |
| ITF - M15 Champaign | 2021/09/16 15:00 | Alexander Kotzen v Cannon Kingsley | 4-6,3-6 |
| ITF - M15 Champaign | 2021/09/15 19:50 | Alexander Kotzen v Lucas Horve | 6-2,6-3 |
| ITF - M25 Koksijde | 2021/08/17 08:00 | Olivier Rojas v Alexander Kotzen | 6-4,6-3 |
| ITF - M15 Gdynia | 2021/08/10 08:00 | Alexander Kotzen v Olaf Pieczkowski | 2-6,6-2,8-10 |
| ITF - M15 Gdynia | 2021/08/09 08:00 | Alexander Kotzen v Piotr Pawlak | 6-2,6-0 |
| ITF - M15 Parnu | 2021/08/05 10:30 | Ergi Kirkin v Alexander Kotzen | 7-6,6-4 |
| ITF - M15 Parnu | 2021/08/04 09:05 | Julius Tverijonas v Alexander Kotzen | 6-3,5-7,2-6 |