| UTR Pro Tennis Series Amsterdam | 2021/11/06 16:00 | Nathan De Veer v Jip Van Assendelft | 2-6,3-5 |
| UTR Pro Tennis Series Amsterdam | 2021/11/04 09:00 | Nathan De Veer v Max Houkes | 0-6,6-4,6-3 |
| UTR Pro Tennis Series Amsterdam | 2021/11/03 09:00 | Nathan De Veer v Jesse Timmermans | 4-5 |
| UTR Pro Tennis Series Amsterdam | 2021/11/02 09:00 | Nathan De Veer v Thorsten Sollie | 3-6,3-5 |
| UTR Pro Tennis Series Amsterdam | 2021/11/01 12:00 | Nathan De Veer v Maxence Broville | 1-6,0-5 |
| UTR Pro Tennis Series Amsterdam | 2021/12/07 10:00 | Yan Sabanin v Niklas Koch | 3-6,3-5 |
| UTR Pro Tennis Series Amsterdam | 2021/12/06 07:00 | Niklas Koch v Miko Wassermann | 6-4,6-7,3-6 |
| ITF M25 Eupen | 2021/09/06 11:00 | Buvaysar Gadamauri v Niklas Koch | 6-2,6-2 |
| ITF M25 Eupen | 2021/09/05 12:00 | Niklas Koch v Arslanbek Temirhanov | 6-1,6-2 |
| ITF M15 Manacor | 2020/01/12 11:30 | Billy Harris v Niklas Koch | 6-1,6-1 |
| ITF M15 Manacor | 2020/01/05 09:00 | Benjamin Pietri v Niklas Koch | 6-0,6-1 |
| ITF M15 Monastir | 2019/12/16 08:00 | Alessandro Coppini v Niklas Koch | 3-6,7-6,10-6 |
| ITF M15 Monastir | 2019/12/15 08:00 | Cheraag Bajwa v Niklas Koch | 6-7,6-4,8-10 |