| UTR Pro Tennis Series Mulheim | 2021/07/27 09:30 | Mark Wallner v Matthew Thomson | 7-6,7-6 |
| UTR Pro Tennis Series Mulheim | 2021/07/26 11:00 | Billy Harris v Mark Wallner | 7-6,7-6 |
| UTR Pro Tennis Series Mulheim | 2021/07/26 11:00 | Guy Den Heijer v Tim Sandkaulen | 7-5,6-3 |
| Challenger Braunschweig | 2021/07/05 09:30 | Tim Sandkaulen v Daniel Michalski | 3-6,5-7 |
| Challenger Braunschweig | 2021/07/04 09:00 | Kacper Zuk v Tim Sandkaulen | 6-2,3-6,6-7 |
| ITF USA F25 | 2018/09/15 17:30 | Alan Kohen v Tim Sandkaulen | 6-4,6-4 |
| ITF USA F25 | 2018/09/14 16:00 | Tim Sandkaulen v Robert Kelly | 6-7,6-1,6-0 |
| ITF Germany F9 | 2018/07/23 10:00 | Louroi Martinez v Tim Sandkaulen | 6-0,3-6,6-3 |
| ITF Germany F9 | 2018/07/22 11:00 | Tim Sandkaulen v Torben Steinorth | 6-4,6-1 |
| ITF Germany F9 | 2018/07/22 08:00 | Tim Sandkaulen v Lodewijk Weststrate | 6-2,7-6 |