Stadium: COURT 10 Round: 25 Ground: Hardcourt outdoor
| ITF M25 Johannesburg | 2021/09/14 08:00 | Ribeiro Marcondes, Igor v Kelsey Stevenson | 5-7,6-7 |
| ITF M25 Sintra | 2021/09/08 14:35 | Dan Added v Ribeiro Marcondes, Igor | 6-2,6-4 |
| ITF M25 Poznan | 2021/08/27 11:30 | Pawel Juszczak v Ribeiro Marcondes, Igor | 6-2,5-7,6-4 |
| ITF M25 Poznan | 2021/08/26 09:00 | Ribeiro Marcondes, Igor v Podzus, Martins | 6-4,6-1 |
| ITF M15 Lodz | 2021/08/20 08:00 | Ribeiro Marcondes, Igor v Wilson Leite | 2-6,1-6 |
| ITF M15 Lodz | 2021/08/19 08:00 | Ribeiro Marcondes, Igor v Valerio Aboian | 6-3,6-1 |
| ITF M15 Lodz | 2021/08/17 10:45 | Ribeiro Marcondes, Igor v Orlikowski, Aleksander | 7-6,6-4 |
| ITF M15 Gdynia | 2021/08/11 12:40 | Daniel Michalski v Ribeiro Marcondes, Igor | 6-2,6-3 |
| ITF M25 Johannesburg | 2021/09/14 11:20 | Vilardo, Francesco v Sibanda, Mehluli Don Ayanda | 6-4,6-3 |
| ITF M15 Castelo Branco | 2021/07/28 16:40 | Sibanda, Mehluli Don Ayanda v Robin Bertrand | 2-6,1-6 |
| ITF M25 Idanha-A-Nova | 2021/07/21 11:35 | Cozbinov, Alexander v Sibanda, Mehluli Don Ayanda | 6-3,6-0 |
| ITF M25 Idanha-A-Nova | 2021/07/14 11:50 | Sibanda, Mehluli Don Ayanda v Garrett Johns | 1-6,5-7 |
| ITF - M15 Antalya | 2021/02/28 11:00 | Sibanda, Mehluli Don Ayanda v Benedikt Henning | 2-6,1-6 |
| Challenger Potchefstroom | 2020/03/12 08:00 | Reboul, Fabien v Sibanda, Mehluli Don Ayanda | 6-4,6-2 |
| Challenger Potchefstroom | 2020/03/09 12:15 | Sibanda, Mehluli Don Ayanda v Courtney John Lock | 7-6,6-4 |
| Coupe Davis | 2020/03/06 08:00 | Sibanda, Mehluli Don Ayanda v Hazem Naw | 3-6,3-6 |