Stadium: Court 6 Round: 62 Ground: Clay
| ITF M15 Sharm El Sheikh | 2021/03/30 08:40 | Mattia Bellucci v Karlo Cubelic | 6-2,6-2 |
| ITF M15 Monastir | 2021/08/08 07:30 | Luca Potenza v Mattia Bellucci | 3-6,3-6 |
| ITF M15 Monastir | 2021/08/07 07:30 | Daniil Glinka v Mattia Bellucci | 4-6,3-6 |
| ITF M15 Monastir | 2021/08/06 07:30 | Thomas Fancutt v Mattia Bellucci | 3-6,4-6 |
| ITF M15 Monastir | 2021/08/05 08:50 | Mattia Bellucci v Khololwam Montsi | 6-2,6-2 |
| ITF M15 Monastir | 2021/08/04 17:25 | Mattia Bellucci v Jacob Brumm | 6-1,6-3 |
| ITF M15 Monastir | 2021/07/27 14:00 | Erik Crepaldi v Mattia Bellucci | 7-6,6-1 |
| ITF M15 Monastir | 2021/07/24 08:30 | Mattia Bellucci v Matias Franco Descotte | 0-6,2-6 |
| ITF M15 Monastir | 2021/07/23 08:25 | Mattia Bellucci v Ajeet Rai | 6-7,6-4,7-6 |
| 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 am Main | 2021/08/10 08:20 | Daniel Cukierman v Karlo Cubelic | 2-6,6-4,10-2 |
| ITF M25 Frankfurt am Main | 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 Antalya | 2021/06/06 07:30 | Karlo Cubelic v Vitali Shvets | 5-7,6-4,3-10 |
| ITF M15 Jeruzsálem | 2021/05/13 07:00 | Karlo Cubelic v Felix Corwin | 2-6,0-6 |
| ITF M15 Jeruzsálem | 2021/05/12 12:00 | Roi Ginat v Karlo Cubelic | 1-6,3-6 |