Stadium: Court 6 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Oldenzaal | 2021/08/16 10:00 | Adrian Oetzbach v Karlo Cubelic | 5-7,7-5,3-10 |
| Challenger Maia | 2021/12/05 11:00 | Gergely Madarasz v Adrian Oetzbach | 4-6,6-4,6-3 |
| ITF M15 Sharm El Sheikh | 2021/11/17 11:45 | Tsung-Hao Huang v Adrian Oetzbach | 7-6,6-0 |
| ITF M15 Sharm El Sheikh | 2021/11/16 10:00 | Leonid Sheyngezikht v Adrian Oetzbach | 2-6,2-6 |
| ITF M15 Sharm El Sheikh | 2021/11/15 11:30 | Nikita Ianin v Adrian Oetzbach | 6-7,3-6 |
| ITF M15 Sharm El Sheikh | 2021/11/10 10:20 | Adrian Oetzbach v Emiliano Maggioli | 3-6,4-6 |
| ITF M15 Sharm El Sheikh | 2021/11/09 09:10 | Adrian Oetzbach v Mason Recci | 6-7,7-6,10-4 |
| ITF M15 Sharm El Sheikh | 2021/11/08 09:00 | Henrique S Gomes v Adrian Oetzbach | 1-6,1-6 |
| ITF M15 Sharm El Sheikh | 2021/11/07 13:00 | Adrian Oetzbach v Petar Teodorovic | 2-6,6-2,10-3 |
| ITF M25 Monastir | 2022/01/04 10:00 | Karlo Cubelic v Matas Vasiliauskas | 7-6,4-6,5-7 |
| ITF M15 Sharm El Sheikh | 2021/11/17 11:15 | Sebastian Prechtel v Karlo Cubelic | 6-4,6-4 |
| ITF M15 Sharm El Sheikh | 2021/11/16 08:00 | Karlo Cubelic v Bang Shuo Yin | 6-4,6-7,11-9 |
| ITF M15 Sharm El Sheikh | 2021/11/09 08:00 | Daniel Little v Karlo Cubelic | 6-2,6-1 |
| ITF M15 Sharm El Sheikh | 2021/11/08 08:00 | Ainius Sabaliauskas v Karlo Cubelic | 5-7,2-6 |
| ITF M25 Sarreguemines | 2021/10/26 08:00 | Karlo Cubelic v Gauthier Onclin | 7-5,4-6,3-6 |
| ITF M25 Sarreguemines | 2021/10/25 09:30 | Karlo Cubelic v Jordan Betesh | 7-5,6-3 |
| ITF M25 Sarreguemines | 2021/10/24 09:25 | Karlo Cubelic v Alen Moritz Hodzic | 6-3,6-3 |