Stadium: Court 8 Round: 25 Ground: Clay
| Challenger Cary | 2020/11/10 15:30 | Torpegaard, Mikael v Blumberg, William | 3-6,6-3,6-4 |
| Exo-Tennis Atlanta 2020 | 2020/05/15 16:35 | Blumberg, William v Young, Donald | 1-6,2-6 |
| Exo-Tennis Atlanta 2020 | 2020/05/14 18:50 | King, Kevin v Blumberg, William | 7-5,6-4 |
| Exo-Tennis Atlanta 2020 | 2020/05/14 15:25 | Lovett, Korey v Blumberg, William | 1-6,1-6 |
| ITF M15 Tallahassee | 2019/12/05 16:50 | Blumberg, William v Guy Orly Iradukunda | 6-2,6-7,4-6 |
| ITF M15 Tallahassee | 2019/12/03 19:00 | Stalder, Reese v Blumberg, William | 2-6,4-6 |
| Challenger Champaign | 2019/11/12 17:35 | Blumberg, William v Song, Evan | 4-6,5-7 |
| Challenger Champaign | 2019/11/11 16:00 | Wettengel, Chris v Blumberg, William | 2-6,2-6 |
| 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 |
| 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 - M25 Pensacola | 2021/05/19 18:00 | Strong Kirchheimer v Rodriguez-Pace, Ricardo | 6-4,6-3 |
| Challenger - Tallahassee | 2021/04/19 16:45 | Alexander Ritschard v Strong Kirchheimer | 6-0,7-6 |