Stadium: Center Court Round: 19 Ground: Clay
| 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 |
| 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 |
| Challenger Braunschweig | 2021/07/04 09:00 | Daniel Michalski v Adrian Andreev | 7-6,7-6 |
| ITF M25 Wroclaw | 2021/07/01 08:50 | Toby Alex Kodat v Daniel Michalski | 6-7,6-4,6-0 |
| ITF M25 Wroclaw | 2021/06/30 09:30 | Sandro Szic v Daniel Michalski | 1-6,2-6 |
| Challenger Almaty Qual | 2021/06/13 07:40 | Jesper De Jong v Daniel Michalski | 6-2,6-1 |
| Challenger Almaty | 2021/06/06 04:00 | Daniel Michalski v Corentin Denolly | 6-3,6-7,2-6 |
| ITF M25 Most | 2021/05/28 08:30 | Daniel Michalski v Alex Rybakov | 4-6,4-6 |
| ITF M25 Most | 2021/05/27 10:45 | Ergi Kirkin v Daniel Michalski | 4-6,0-6 |
| ITF M25 Most | 2021/05/26 11:10 | Petr Cervinka v Daniel Michalski | 1-6,1-6 |