| UTR Pro Tennis Series Mulheim | 2021/07/28 07:00 | Tim Gennes v Hendrik Jebens | 1-6,3-5 |
| UTR Pro Tennis Series Mulheim | 2021/07/26 12:30 | Marvin Schaber v Tim Gennes | 6-2,7-6 |
| UTR Pro Tennis Series Mulheim | 2021/07/26 12:30 | Vasile Antonescu v John Sperle | 6-3,5-2 |
| ITF M15 Antalya | 2021/05/31 08:30 | Daniel Antonio Nunez v John Sperle | 6-4,7-5 |
| ITF M15 Antalya | 2021/05/23 07:00 | John Sperle v Jip Van Assendelft | 5-7,7-5,4-10 |
| ITF M15 Troisdorf | 2021/05/11 10:15 | John Sperle v Aliaksandr Bulitski | 6-2,4-6,5-10 |
| ITF M15 Troisdorf | 2021/05/10 09:30 | John Sperle v Tim Riedel | 5-7,6-1,10-6 |
| ITF M15 Troisdorf | 2021/05/09 10:00 | Adrian Obert v John Sperle | 3-6,2-6 |
| ITF 25 Meerbusch | 2021/04/13 09:30 | David Pichler v John Sperle | 6-0,6-2 |
| ITF 25 Meerbusch | 2021/04/11 12:45 | Luc Hoeijmans v John Sperle | 1-6,3-6 |