Stadium: Hard Court 4 Round: 62 Ground: Hardcourt outdoor
| ITF - M25 Nussloch | 2024/01/22 13:00 | Leopold Zima v Karlo Cubelic | 6-4,6-2 |
| ITF - M25 Nussloch | 2024/01/21 14:30 | Nino Toto v Karlo Cubelic | 6-7,1-6 |
| ITF - M15 Cadolzburg | 2024/01/17 16:05 | Max Hans Rehberg v Karlo Cubelic | 4-6,6-4,7-5 |
| ITF - M15 Cadolzburg | 2024/01/15 10:00 | Karlo Cubelic v David Eichenseher | 6-3,6-1 |
| ITF - M15 Cadolzburg | 2024/01/14 15:30 | Karlo Cubelic v Emil Rast | 6-1,6-2 |
| ITF - M15 Sharm El Sheikh | 2023/11/26 10:30 | Matteo Meneghetti v Karlo Cubelic | 0-6,1-6 |
| ITF - M15 Sharm El Sheikh | 2023/11/22 09:35 | Jiri Barnat v Karlo Cubelic | 6-0,4-6,6-3 |
| ITF - M15 Sharm El Sheikh | 2023/11/21 08:00 | Karlo Cubelic v Daniil Savelev | 7-5,7-5 |
| ITF - M15 Antalya | 2024/01/07 06:30 | Ruenger, Roman v Gabriel Matuszewski | 4-6,3-6 |
| ITF M25 Telavi | 2023/10/22 06:00 | Ivan Denisov v Ruenger, Roman | 6-3,6-2 |
| ITF M25 Telavi | 2023/10/16 06:00 | Ruenger, Roman v Jeremy Gschwendtner | 1-6,2-6 |
| ITF M25 Telavi | 2023/10/15 06:00 | Ruenger, Roman v Savelii Shpita | 6-7,6-1,10-2 |
| ITF M25 Esch/Alzette Qual | 2023/07/16 09:25 | Mats Bredschneijder v Ruenger, Roman | 6-2,6-3 |
| ITF M25 Most | 2023/05/22 08:00 | Aleksandr Braynin v Ruenger, Roman | 7-5,6-3 |
| ITF M15 Pazardzhik | 2023/05/15 11:30 | Mihai Razvan Marinescu v Ruenger, Roman | 7-5,6-1 |
| ITF M15 Pazardzhik | 2023/05/15 07:00 | Ruenger, Roman v Vardan Manukyan | 7-5,7-5 |