Stadium: Court 1 Round: 54 Ground: Hardcourt indoor
| UTR Pro Tennis Series Mulheim | 2021/10/16 12:30 | Melchior Delloye v Tom Schonenberg | 6-4,6-4 |
| UTR Pro Tennis Series Mulheim | 2021/10/15 07:00 | Tom Schonenberg v Alen Moritz Hodzic | 6-2,6-5 |
| ITF M15 Nur-Sultan | 2021/02/09 06:45 | Tom Schonenberg v Oscar Weightman | 3-6,6-3,5-10 |
| ITF M15 Nur-Sultan | 2021/02/08 06:00 | Sagadat Ayap v Tom Schonenberg | 6-2,4-6,11-13 |
| ITF M15 Nur-Sultan | 2021/02/01 07:30 | Tom Schonenberg v Oscar Moraing | 6-3,4-6,3-10 |
| ITF M15 Bressuire | 2021/01/18 08:30 | Lucas Poullain v Tom Schonenberg | 7-5,6-4 |
| ITF M15 Bressuire | 2021/01/17 11:05 | Karlo Cubelic v Tom Schonenberg | 4-6,4-6 |
| ITF M15 Monastir | 2020/12/13 09:00 | Fausto Tabacco v Tom Schonenberg | 7-6,7-5 |
| ITF M15 Monastir | 2021/08/26 07:30 | Kai Lemstra v Renta Tokuda | 2-6,2-6 |
| ITF M15 Monastir | 2021/08/25 07:30 | Hamzeh Al-Aswad v Kai Lemstra | 2-6,1-6 |
| ITF M15 Monastir | 2021/08/24 07:30 | Seita Watanabe v Kai Lemstra | 1-6,1-6 |
| ITF M15 Monastir | 2021/08/23 09:00 | Alec Beckley v Kai Lemstra | 3-6,2-6 |
| ITF M15 Monastir | 2021/08/22 12:00 | Lucca Pinto v Kai Lemstra | 3-6,0-6 |
| ITF M15 Monastir | 2021/08/18 09:00 | Kai Lemstra v Duarte Vale | 4-6,3-6 |
| ITF M15 Monastir | 2021/08/17 07:30 | Federico Salomone v Kai Lemstra | 4-6,6-4,8-10 |
| ITF M15 Monastir | 2021/08/16 07:30 | Kai Lemstra v Blake Ellis | 6-4,6-3 |