Round: 1 Ground: Hardcourt indoor
| Davis Cup | 2018/04/05 09:10 | Martins Podzus v Ljubomir Celebic | 4-6,5-7 |
| Davis Cup | 2018/04/04 09:05 | Ljubomir Celebic v Sedrak Khachatryan | 6-0,6-0 |
| ITF Croatia F3 | 2018/03/23 10:00 | Nino Serdarusic v Ljubomir Celebic | 4-6,6-3,6-2 |
| ITF Croatia F3 | 2018/03/22 09:00 | Mike Urbanija v Ljubomir Celebic | 6-0,3-6,2-6 |
| 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 |
| Davis Cup | 2018/04/04 09:10 | Martins Podzus v Markos Kalovelonis | 3-6,4-6 |
| ITF Greece F5 | 2018/03/28 06:00 | Markos Kalovelonis v Ioannis Stergiou | 3-6,2-6 |
| ITF Greece F4 | 2018/03/23 14:00 | Markos Kalovelonis v Baptiste Crepatte | 3-6,2-6 |
| ITF Greece F4 | 2018/03/23 09:40 | Lukas Klein v Markos Kalovelonis | 6-7,3-6 |
| ITF Greece F4 | 2018/03/20 10:20 | Markos Kalovelonis v Fran Zvonimir Zgombic | 6-4,6-4 |
| ITF Greece F3 | 2018/03/15 13:05 | Filippo Baldi v Markos Kalovelonis | 6-3,6-3 |
| ITF Greece F3 | 2018/03/14 08:00 | Markos Kalovelonis v Alex Brenner | 6-2,6-2 |
| ITF Greece F2 | 2018/03/09 11:55 | Danilo Petrovic v Markos Kalovelonis | 4-6,7-6,6-1 |