Stadium: Court 3 Round: 26 Ground: Hardcourt outdoor
| ITF M25 Pretoria | 2021/09/29 12:20 | Ryan Nijboer v Menelaos Efstathiou | 6-3,6-0 |
| ITF M25 Johannesburg | 2021/09/21 10:25 | Rio Noguchi v Ryan Nijboer | 7-6,2-6,6-3 |
| ITF M25 Johannesburg | 2021/09/15 08:00 | Alafia Ayeni v Ryan Nijboer | 7-5,6-3 |
| ITF M25 Trier | 2021/08/27 15:00 | Ryan Nijboer v Henri Squire | 2-6,3-6 |
| ITF M25 Trier | 2021/08/26 09:30 | Schmitz, Constantin v Ryan Nijboer | 4-6,2-6 |
| ITF M25 Trier | 2021/08/25 09:00 | Tom Gentzsch v Ryan Nijboer | 3-6,4-6 |
| ITF M15 Oldenzaal | 2021/08/19 12:45 | Hoogmartens, Alexander v Ryan Nijboer | 1-6,7-5,6-3 |
| ITF M15 Oldenzaal | 2021/08/18 12:45 | Alec Deckers v Ryan Nijboer | 6-3,2-6,4-6 |
| ITF M25 Pretoria | 2021/09/29 13:25 | Badenhorst, Devin v Sibanda, Mehluli Don Ayanda | 6-2,6-3 |
| ITF M25 Pretoria | 2021/09/28 07:00 | Neil Oberleitner v Badenhorst, Devin | 6-4,4-6,7-10 |
| ITF M25 Pretoria | 2021/09/27 08:50 | Scott, Andreas v Badenhorst, Devin | 0-6,6-4,9-11 |
| ITF M25 Pretoria | 2021/09/26 07:00 | Jacob Pieter Lubbe v Badenhorst, Devin | 2-6,4-6 |
| ITF M25 Johannesburg | 2021/09/22 09:00 | Badenhorst, Devin v Beale, Jeremy | 3-6,4-6 |
| ITF - M15 Monastir | 2021/06/13 11:30 | Badenhorst, Devin v Terence Atmane | 1-6,3-6 |
| ITF - M15 Monastir | 2021/06/09 11:15 | Nam, Ji Sung v Badenhorst, Devin | 6-7,6-2,7-6 |
| ITF - M15 Monastir | 2021/06/07 13:30 | Kazuma Kawachi v Badenhorst, Devin | 3-6,5-7 |