Stadium: Court 5 Round: 25 Ground: Hardcourt outdoor
| Weston, FL, Singles M-ITF-USA-05A | 2021/07/03 00:00 | Murkel Dellien v Strong Kirchheimer | 6-7,6-7 |
| Weston, FL, Singles M-ITF-USA-05A | 2021/07/01 21:55 | Blumberg, William v Strong Kirchheimer | 3-6,3-6 |
| ITF M15 Champaign | 2021/06/23 15:00 | Strong Kirchheimer v Farren, Connor | 3-6,4-6 |
| Tulsa, Singles Main, M-ITF-USA-16A | 2021/06/16 17:10 | Strong Kirchheimer v Hidalgo, Diego | 7-6,2-6,3-6 |
| Orlando, USA | 2021/06/06 16:20 | Strong Kirchheimer v Nicolas Alvarez | 3-6,5-7 |
| Little Rock, USA | 2021/05/31 15:00 | Stefan Kozlov v Strong Kirchheimer | 6-3,6-2 |
| Little Rock, USA | 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 | Stalder, Reese v Parker, Jordan | 6-4,6-0 |
| ITF - M15 Héraklion | 2021/06/07 06:30 | Stalder, Reese v Ginat, Roi | 6-1,6-3 |
| ITF - M15 Héraklion | 2021/06/04 06:30 | Stalder, Reese v Yuki Mochizuki | 2-6,5-7 |
| ITF - M15 Héraklion | 2021/06/03 06:30 | Alexander Donski v Stalder, Reese | 3-6,6-3,4-6 |
| ITF - M15 Héraklion | 2021/06/02 09:50 | Stalder, Reese v Uzhylovsky, Vladimir | 6-3,7-5 |
| ITF - M15 Héraklion | 2021/06/01 06:30 | Stalder, Reese v Zemel, Yankel | 6-1,6-4 |
| ITF - M15 Héraklion | 2021/05/31 06:30 | Stalder, Reese v Stijn Pel | 6-4,4-6,10-7 |
| ITF - M15 Héraklion | 2021/05/30 09:00 | Stalder, Reese v Matthew Dellavedova | 6-3,2-6,10-4 |