Stadium: Court 5 Round: 26 Ground: Hardcourt outdoor
| ITF M15 - Edwardsville | 2021/07/21 16:00 | Strong Kirchheimer v Reese Stalder | 7-6,7-6 |
| ITF M15 - Weston | 2021/07/03 00:00 | Murkel Dellien v Strong Kirchheimer | 6-7,6-7 |
| ITF M15 - Weston | 2021/07/01 21:55 | William Blumberg v Strong Kirchheimer | 3-6,3-6 |
| ITF - M15 Champaign | 2021/06/23 15:00 | Strong Kirchheimer v Connor Farren | 3-6,4-6 |
| ITF M25 - Tulsa | 2021/06/16 17:10 | Strong Kirchheimer v Diego Hidalgo | 7-6,2-6,3-6 |
| Challenger - Orlando | 2021/06/06 16:20 | Strong Kirchheimer v Nicolas Alvarez | 3-6,5-7 |
| Challenger - Little Rock | 2021/05/31 15:00 | Stefan Kozlov v Strong Kirchheimer | 6-3,6-2 |
| Challenger - Little Rock | 2021/05/30 19:40 | Strong Kirchheimer v Aleksandar Kovacevic | 6-4,6-7,7-6 |
| ITF M15 - Edwardsville | 2021/07/21 14:00 | Ozan Baris v Victor Lilov | 6-4,4-6,5-7 |
| ITF - M15 Champaign | 2021/06/23 17:10 | Siphosothando Montsi v Victor Lilov | 6-4,6-1 |
| ITF - M15 Champaign | 2021/06/22 15:00 | Victor Lilov v Preston Brown | 7-5,6-0 |
| ITF - M15 Champaign | 2021/06/21 15:00 | Tristan Schoolkate v Victor Lilov | 4-6,4-6 |
| ITF - M25 Pensacola | 2021/05/17 14:30 | Peter Bertran v Victor Lilov | 6-2,6-1 |