Stadium: Court 1 Round: 27 Ground: Hardcourt outdoor
| ITF M25 Pretoria MD | 2021/09/28 12:00 | Beckley/Hunter v Nijboer/Oberleitner | 6-3,3-6,8-10 |
| ITF M25 Johannesburg MD | 2021/09/22 13:05 | Malan/Scott v Nijboer/Oberleitner | 5-7,6-3,15-13 |
| ITF M25 Johannesburg MD | 2021/09/17 12:10 | Alves/Marcondes v Nijboer/Oberleitner | 7-6,6-7,10-6 |
| ITF M25 Johannesburg MD | 2021/09/16 13:30 | Niki/Vilardo v Nijboer/Oberleitner | 2-6,3-6 |
| ITF M25 Johannesburg MD | 2021/09/14 14:00 | Seelig/Sibanda v Nijboer/Oberleitner | 2-6,7-5,8-10 |
| ITF M15 Sharm El Sheikh MD | 2021/04/10 08:00 | Nijboer/Oberleitner v Ochi/Shimizu | 4-6,7-6,10-6 |
| ITF M15 Sharm El Sheikh MD | 2021/04/08 11:30 | Nijboer/Oberleitner v Krainer/Setkic | 6-1,6-3 |
| ITF M15 Sharm El Sheikh MD | 2021/04/02 11:45 | Niki/Poljak v Nijboer/Oberleitner | 5-7,5-7 |