Stadium: Court 1 Round: 14 Ground: Clay
| Challenger Rio De Janeiro | 2021/12/15 14:00 | Thiago Seyboth Wild v Johan Nikles | 6-1,3-6,7-5 |
| Challenger Rio De Janeiro | 2021/12/14 13:00 | Johan Nikles v Luca Castelnuovo | 6-2,6-4 |
| Challenger Florianopolis | 2021/12/09 14:25 | Juan Ignacio Londero v Johan Nikles | 6-1,6-4 |
| Challenger Florianopolis | 2021/12/06 19:00 | Guilherme Clezar v Johan Nikles | 3-6,7-6,2-6 |
| Challenger Sao Paulo | 2021/12/01 14:15 | Johan Nikles v Felipe Meligeni Rodrigues Alves | 7-6,2-6,1-6 |
| Challenger Sao Paulo | 2021/11/30 12:30 | Johan Nikles v Kaichi Uchida | 6-7,7-6,6-0 |
| Challenger Brasilia | 2021/11/22 16:00 | Johan Nikles v Juan Ignacio Londero | 4-6,4-6 |
| Challenger Campinas | 2021/11/16 13:00 | Thiago Monteiro v Johan Nikles | 6-2,6-1 |
| Challenger Antalya | 2021/12/10 07:00 | Alexandar Lazarov v Evgeny Tyurnev | 4-6,7-6,1-6 |
| Challenger Antalya | 2021/12/09 07:00 | Andrey Chepelev v Alexandar Lazarov | 2-6,0-6 |
| Challenger Antalya | 2021/12/08 11:20 | Alexandar Lazarov v Marsel Ilhan | 6-3,6-3 |
| Challenger Manama | 2021/11/25 11:30 | Alexandar Lazarov v Nerman Fatic | 6-3,7-6 |
| Challenger Manama | 2021/11/23 11:20 | Altug Celikbilek v Alexandar Lazarov | 2-6,3-6 |
| Challenger Manama | 2021/11/22 08:00 | Johannes Haerteis v Alexandar Lazarov | 3-6,6-7 |
| Challenger Manama | 2021/11/21 10:00 | Alexander Cozbinov v Alexandar Lazarov | 1-6,2-6 |
| Challenger Bratislava | 2021/11/07 15:55 | Alexandar Lazarov v Alexander Shevchenko | 6-4,5-7,3-6 |