Stadium: Opatija 3 Round: 26 Ground: Clay
| ITF Italy F32 | 2016/05/18 11:30 | Ljubomir Celebic v Mike Urbanija | 6-3,6-2 |
| ITF Croatia F3 | 2018/03/21 14:25 | Edoardo Sardella v Mike Urbanija | 3-6,4-6 |
| ITF Croatia F3 | 2018/03/20 09:00 | Mike Urbanija v Constantin Christ | 6-0,6-2 |
| ITF Croatia F3 | 2018/03/19 11:00 | Mike Urbanija v Nemanja Subanovic | 3-6,6-4,6-2 |
| ITF Croatia F2 | 2018/03/15 09:00 | Mike Urbanija v Mate Valkusz | 1-6,4-6 |
| ITF Croatia F2 | 2018/03/14 09:00 | Mate Delic v Mike Urbanija | 5-7,6-2,4-6 |
| ITF Croatia F2 | 2018/03/13 08:00 | Mike Urbanija v Flemming Peters | 6-3,6-0 |
| ITF Croatia F2 | 2018/03/11 08:00 | Mike Urbanija v Andrea Fiorentini | 6-4,6-0 |
| ITF Turkey F7 | 2018/02/19 08:00 | Mike Urbanija v Marko Miladinovic | 2-6,2-6 |
| ITF Croatia F3 | 2018/03/21 13:45 | Ljubomir Celebic v Tomas Lipovsek Puches | 1-6,6-3,6-3 |
| ITF Greece F3 | 2018/03/13 08:00 | Riccardo Balzerani v Ljubomir Celebic | 6-4,6-1 |
| ITF Greece F2 | 2018/03/06 08:00 | Ljubomir Celebic v Giovanni Fonio | 6-3,3-6,4-6 |
| ITF Greece F1 | 2018/03/03 09:40 | Ljubomir Celebic v Yannick Jankovits | 4-6,6-7 |
| ITF Greece F1 | 2018/03/02 10:00 | Luke Johnson v Ljubomir Celebic | 4-6,6-7 |
| ITF Greece F1 | 2018/03/01 08:00 | Ljubomir Celebic v Adrian Bodmer | 6-2,6-0 |
| ITF Greece F1 | 2018/02/28 11:00 | Andrea Guerrieri v Ljubomir Celebic | 4-6,0-6 |
| ITF Tunisia F3 | 2018/01/26 08:30 | Ljubomir Celebic v Pol Toledo Bague | 6-1,6-3 |