Stadion: 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 | Constantin Schmitz 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 | Alexander Hoogmartens 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 | Devin Badenhorst v Mehluli D A Sibanda | 6-2,6-3 |
| ITF - M25 - Pretoria | 2021/09/28 07:00 | Neil Oberleitner v Devin Badenhorst | 6-4,4-6,7-10 |
| ITF - M25 - Pretoria | 2021/09/27 08:50 | Andreas Scott v Devin Badenhorst | 0-6,6-4,9-11 |
| ITF - M25 - Pretoria | 2021/09/26 07:00 | Jacob Pieter Lubbe v Devin Badenhorst | 2-6,4-6 |
| ITF - M25 - Johannesburg | 2021/09/22 09:00 | Devin Badenhorst v Jeremy Beale | 3-6,4-6 |
| ITF - M15 - Monastir | 2021/06/13 11:30 | Devin Badenhorst v Terence Atmane | 1-6,3-6 |
| ITF - M15 - Monastir | 2021/06/09 11:15 | Ji Sung Nam v Devin Badenhorst | 6-7,6-2,7-6 |
| ITF - M15 - Monastir | 2021/06/07 13:30 | Kazuma Kawachi v Devin Badenhorst | 3-6,5-7 |