Stadion: Court 2 Round: 25 Ground: Hardcourt outdoor
| 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 - M15 - Frederiksberg | 2021/08/05 10:00 | Ryan Nijboer v Benjamin Hannestad | 1-6,6-4,2-6 |
| ITF - M25 - Pretoria | 2021/09/28 07:00 | Menelaos Efstathiou v Tadija Radovanovic | 6-2,6-1 |
| ITF - M25 - Pretoria | 2021/09/27 08:30 | Menelaos Efstathiou v Munashe Chingono | 6-2,6-3 |
| ITF - M25 - Johannesburg | 2021/09/23 08:30 | Alec Beckley v Menelaos Efstathiou | 7-6,6-4 |
| ITF - M25 - Johannesburg | 2021/09/22 10:10 | Leonid Sheyngezikht v Menelaos Efstathiou | 1-6,1-6 |
| ITF - M25 - Johannesburg | 2021/09/21 07:00 | Menelaos Efstathiou v Preston Brown | 6-2,6-2 |
| ITF - M25 - Johannesburg | 2021/09/20 08:45 | Menelaos Efstathiou v Nikolai C Hensberg | 6-2,6-0 |
| ITF - M25 - Johannesburg | 2021/09/19 11:50 | Menelaos Efstathiou v Benjamin Scott | 6-0,6-2 |
| ITF - M25 - Johannesburg | 2021/09/16 09:40 | Menelaos Efstathiou v Dylan Salton | 2-6,4-6 |