Stadium: Court 11 Round: 44 Ground: Hardcourt outdoor
| ITF - M15 Doha | 2021/10/06 17:35 | Karlo Cubelic v Tao Mu | 2-6,3-6 |
| ITF - M25 Eupen | 2021/09/07 15:25 | Karlo Cubelic v Maxime Chazal | 3-6,2-6 |
| ITF - M15 Oldenzaal | 2021/08/17 07:30 | Mattia Bellucci v Karlo Cubelic | 7-6,7-5 |
| ITF - M15 Oldenzaal | 2021/08/16 10:00 | Adrian Oetzbach v Karlo Cubelic | 5-7,7-5,3-10 |
| ITF - M15 Oldenzaal | 2021/08/15 12:00 | Jing L Weng v Karlo Cubelic | 3-6,1-6 |
| ITF - M25 Frankfurt nad Mohanom | 2021/08/10 08:20 | Daniel Cukierman v Karlo Cubelic | 2-6,6-4,10-2 |
| ITF - M25 Frankfurt nad Mohanom | 2021/08/09 11:05 | Jan Soeren Hain v Karlo Cubelic | 3-6,2-6 |
| ITF - M25 Marburg | 2021/07/05 13:55 | Dominik Recek v Karlo Cubelic | 6-4,6-2 |
| ITF - M15 Doha - kvalifikácia | 2021/10/10 13:55 | Danylo Semenov v Nico Hornitschek | 2-6,4-6 |
| ITF - M15 Doha | 2021/10/07 15:25 | Nico Hornitschek v Aleksandre Bakshi | 2-6,4-6 |
| ITF - M15 Doha | 2021/10/06 12:30 | Nico Hornitschek v Felipe Mikkelsen | 4-6,6-3,6-2 |
| ITF - M15 Doha | 2021/10/04 12:00 | Dheeraj Kodancha Srinivasan v Nico Hornitschek | 6-7,1-6 |
| ITF - M15 Doha | 2021/10/03 12:00 | Radu F Macovei v Nico Hornitschek | 3-6,0-6 |
| ITF - M15 Vyškovo | 2021/09/23 08:30 | Nico Hornitschek v Gergely Madarasz | 4-6,6-2,1-6 |
| ITF - M15 Vyškovo | 2021/09/21 07:00 | Mykhailo Mossur v Nico Hornitschek | 2-6,3-6 |
| ITF - M25 Eupen | 2021/09/06 13:30 | Nico Hornitschek v Tom Gentzsch | 4-6,4-6 |