Stadium: Court 4 Round: 54 Ground: Clay
| Challenger Portoroz Qual | 2018/08/04 15:00 | Ambrozic, David Lucas v Lipovsek Puches, Tomas | 0-6,0-6 |
| ITF Austria F5 Qual | 2018/07/30 12:00 | Leuch, Vital Flurin v Ambrozic, David Lucas | 6-1,6-0 |
| ITF Austria F5 Qual | 2018/07/29 10:30 | Filippo Giovannini v Ambrozic, David Lucas | 2-6,6-4,4-6 |
| ITF Austria F5 Qual | 2018/07/28 10:00 | Matic, Luka v Ambrozic, David Lucas | 6-2,6-7,0-6 |
| ITF Belgium F4 | 2018/07/14 12:00 | Simon Beaupain v Ambrozic, David Lucas | 6-1,6-4 |
| ITF Belgium F4 | 2018/07/14 08:30 | Borms, Stefan v Ambrozic, David Lucas | 6-7,0-6 |
| ITF Greece F10 | 2017/11/19 08:00 | Schinas, Stephanos v Ambrozic, David Lucas | 6-1,7-6 |
| ITF Greece F9 Qual | 2017/11/11 08:30 | Russo, Cristiano v Ambrozic, David Lucas | 6-2,6-0 |
| ITF Serbia F4 | 2018/08/30 10:35 | Miladinovic, Marko v Aleksa Ciric | 6-4,6-3 |
| ITF Serbia F4 | 2018/08/29 08:30 | Aleksa Ciric v Jandric, Darko | 6-4,6-3 |
| ITF Serbia F4 | 2018/08/27 10:10 | Aleksa Ciric v Kapiris, Stamatis | 6-2,6-3 |
| ITF Serbia F4 | 2018/08/26 07:00 | Hiramatsu, Shinnosuke v Aleksa Ciric | 7-5,1-6,5-7 |
| ITF Serbia F3 | 2018/08/21 11:00 | Miladinovic, Marko v Aleksa Ciric | 6-2,6-1 |
| ITF Serbia F1 Qual | 2018/08/05 10:30 | Rajic, Dusan v Aleksa Ciric | 6-7,6-3,6-3 |
| ITF Serbia F1 Qual | 2018/08/04 09:30 | Aleksa Ciric v Feler, Melik | 4-6,6-2,6-2 |