Stadium: Court 5 Round: 25 Ground: Hardcourt outdoor
| 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 M25 - Pensacola | 2021/05/20 14:25 | Strong Kirchheimer v Nicolas Kicker | 6-4,5-7,2-6 |
| ITF M15 - Edwardsville | 2021/07/20 14:30 | Reese Stalder v Jordan Parker | 6-4,6-0 |
| ITF M15 - Heraklion | 2021/06/07 06:30 | Reese Stalder v Roi Ginat | 6-1,6-3 |
| ITF M15 - Heraklion | 2021/06/04 06:30 | Reese Stalder v Yuki Mochizuki | 2-6,5-7 |
| ITF M15 - Heraklion | 2021/06/03 06:30 | Alexander Donski v Reese Stalder | 3-6,6-3,4-6 |
| ITF M15 - Heraklion | 2021/06/02 09:50 | Reese Stalder v Volodymyr Uzhylovskyi | 6-3,7-5 |
| ITF M15 - Heraklion | 2021/06/01 06:30 | Reese Stalder v Yasha Zemel | 6-1,6-4 |
| ITF M15 - Heraklion | 2021/05/31 06:30 | Reese Stalder v Stijn Pel | 6-4,4-6,10-7 |
| ITF M15 - Heraklion | 2021/05/30 09:00 | Reese Stalder v Matthew Dellavedova | 6-3,2-6,10-4 |