Ground: Clay
| ITF M15 Weston | 2021/07/01 15:25 | Kyle Seelig v Gonzalo Villanueva | 6-3,6-7,6-7 |
| ITF M15 Weston | 2021/07/01 15:25 | Kyle Seelig v Gonzalo Villanueva | 6-3,6-7,6-7 |
| ITF M25 Weston | 2021/06/29 23:30 | Kyle Seelig v Jack Anthrop | 6-2,4-6,10-3 |
| ITF M25 Weston | 2021/06/29 21:00 | Kyle Seelig v Evan Bynoe | 6-4,7-6 |
| ITF M15 Champaign | 2021/06/26 15:00 | Gabriel Diallo v Kyle Seelig | 6-4,6-3 |
| ITF M15 Champaign | 2021/06/25 16:55 | Michail Pervolarakis v Kyle Seelig | 4-6,1-6 |
| ITF M15 Champaign | 2021/06/24 14:55 | Kyle Seelig v Thomaz Bellucci | 2-6,6-2,6-4 |
| ITF M15 Champaign | 2021/06/23 19:10 | Vasil Kirkov v Kyle Seelig | 6-4,3-6,6-7 |
| ITF M15 Champaign | 2021/06/22 15:00 | Kyle Seelig v José Pereira | 7-6,7-6 |
| ITF M15 Weston | 2021/07/01 15:25 | Kyle Seelig v Gonzalo Villanueva | 6-3,6-7,6-7 |
| ITF M15 Champaign | 2021/06/23 17:15 | Gonzalo Villanueva v Kweisi Kenyatte | 6-3,6-7,4-6 |
| ITF M25 Tulsa | 2021/06/17 13:55 | Gonzalo Villanueva v Gage Brymer | 4-6,3-6 |
| ITF M25 Tulsa | 2021/06/16 16:30 | Adrian Andreev v Gonzalo Villanueva | 6-2,3-6,4-6 |
| Challenger Orlando | 2021/06/06 16:10 | Adrian Andreev v Gonzalo Villanueva | 3-6,6-3,7-6 |
| Challenger de Little Rock | 2021/05/30 20:10 | Zachary Svajda v Gonzalo Villanueva | 6-0,5-7,6-2 |
| Challenger Salinas 2 | 2021/04/29 15:00 | Gonzalo Villanueva v JC Aragone | 2-6,2-6 |
| Challenger Salinas 2 | 2021/04/28 16:30 | Gonzalo Villanueva v Hernan Casanova | 7-5,6-0 |