| ITF M15 Antalya | 2021/03/25 07:00 | Guy Den Heijer v Juan Pablo Paz | 1-6,2-6 |
| ITF M15 Antalya | 2021/03/24 06:30 | Guy Den Heijer v Carlo Alberto Fossati | 6-2,6-3 |
| ITF M15 Antalya | 2021/03/22 07:00 | Guy Den Heijer v Vladislav Gorbatenko | 7-5,6-0 |
| ITF M15 Antalya | 2021/03/21 07:00 | Guy Den Heijer v Alexander Ovcharov | 6-1,6-2 |
| ITF M15 Antalya | 2021/03/17 08:00 | Koray Kirci v Guy Den Heijer | 6-4,6-2 |
| ITF M15 Antalya | 2021/03/16 07:00 | Guy Den Heijer v Giovanni Rizzuti | 7-5,6-2 |
| ITF M15 Antalya | 2021/03/15 08:30 | Guy Den Heijer v Juan Ignacio Alcalde | 6-1,6-1 |
| ITF M15 Antalya | 2021/03/14 07:00 | Guy Den Heijer v Andrea Gola | 6-1,6-3 |
| 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 |
| Challenger Meerbusch Qual | 2017/08/12 12:10 | Antonio Sancic v Tim Sandkaulen | 7-6,6-1 |
| ITF Netherlands F4 | 2017/07/11 08:00 | Tom Farquharson v Tim Sandkaulen | 6-2,6-2 |
| ITF Netherlands F4 | 2017/07/09 08:00 | Tim Sandkaulen v Joris Bodin | 6-2,6-1 |