Stadium: Court 4 Round: 45 Ground: Clay
| ITF Croatia F3 | 2018/03/18 14:30 | Tino Kovacic v Karlo Cubelic | 4-6,5-7 |
| ITF Slovakia F1 | 2018/07/22 11:00 | Tino Kovacic v Patrik Obal | 4-6,1-6 |
| ITF Slovakia F1 | 2018/07/21 11:00 | Leon Petko v Tino Kovacic | 2-6,7-5,5-7 |
| ITF Hungary F5 Qual | 2018/06/16 08:00 | Petr Nouza v Tino Kovacic | 6-2,6-3 |
| ITF Hungary F3 Qual | 2018/05/19 08:00 | Marko Ilic v Tino Kovacic | 7-6,1-6,6-4 |
| ITF Hungary F2 | 2018/05/15 11:20 | Tino Kovacic v Denis Klok | 2-6,1-6 |
| ITF Hungary F2 Qual | 2018/05/13 08:00 | Ville-Petteri Ahti v Tino Kovacic | 6-7,3-6 |
| ITF Hungary F1 Qual | 2018/05/06 08:00 | Tino Kovacic v Leevi Saatela | 4-6,6-4,6-0 |
| ITF Hungary F1 Qual | 2018/05/05 10:00 | Victor Gurevich v Tino Kovacic | 3-6,1-6 |
| ITF Austria F5 Qual | 2018/07/28 07:00 | Michal Lusovsky v Karlo Cubelic | 3-6,6-4,6-7 |
| ITF Germany F9 | 2018/07/22 08:00 | Louroi Martinez v Karlo Cubelic | 6-3,7-5 |
| ITF Germany F8 Qual | 2018/07/16 15:35 | Philipp Davydenko v Karlo Cubelic | 7-5,6-2 |
| ITF Germany F8 Qual | 2018/07/15 14:00 | Karlo Cubelic v Marcus Mansson | 6-2,7-6 |
| ITF Germany F8 Qual | 2018/07/15 10:00 | Felix Andre v Karlo Cubelic | 2-6,1-6 |
| ITF Netherlands F3 | 2018/07/08 09:30 | Arklon H D Pino v Karlo Cubelic | 6-1,7-5 |
| ITF Netherlands F3 | 2018/07/07 12:15 | Karlo Cubelic v Daniel Grunberger | 3-6,6-3,6-3 |
| ITF Netherlands F3 | 2018/07/07 07:30 | Karlo Cubelic v Tom Clavel | 6-4,6-2 |