| Coupe Davis | 2018/04/05 09:10 | Podzus, Martins v Celebic, Ljubomir | 4-6,5-7 |
| Coupe Davis | 2018/04/04 09:05 | Celebic, Ljubomir v Khachatryan, Sedrak | 6-0,6-0 |
| ITF Croatia F3 | 2018/03/23 10:00 | Nino Serdarusic v Celebic, Ljubomir | 4-6,6-3,6-2 |
| ITF Croatia F3 | 2018/03/22 09:00 | Urbanija, Mike v Celebic, Ljubomir | 6-0,3-6,2-6 |
| ITF Croatia F3 | 2018/03/21 13:45 | Celebic, Ljubomir v Lipovsek Puches, Tomas | 1-6,6-3,6-3 |
| ITF Greece F3 | 2018/03/13 08:00 | Balzerani, Riccardo v Celebic, Ljubomir | 6-4,6-1 |
| ITF Greece F2 | 2018/03/06 08:00 | Celebic, Ljubomir v Giovanni Fonio | 6-3,3-6,4-6 |
| ITF Greece F1 | 2018/03/03 09:40 | Celebic, Ljubomir v Jankovits, Yannick | 4-6,6-7 |
| Coupe Davis | 2018/04/04 09:10 | Podzus, Martins v Kalovelonis, Markos | 3-6,4-6 |
| ITF Greece F5 | 2018/03/28 06:00 | Kalovelonis, Markos v Stergiou, Ioannis | 3-6,2-6 |
| ITF Greece F4 | 2018/03/23 14:00 | Kalovelonis, Markos v Crepatte, Baptiste | 3-6,2-6 |
| ITF Greece F4 | 2018/03/23 09:40 | Lukas Klein v Kalovelonis, Markos | 6-7,3-6 |
| ITF Greece F4 | 2018/03/20 10:20 | Kalovelonis, Markos v Zgombic, Fran Zvonimir | 6-4,6-4 |
| ITF Greece F3 | 2018/03/15 13:05 | Baldi, Filippo v Kalovelonis, Markos | 6-3,6-3 |
| ITF Greece F3 | 2018/03/14 08:00 | Kalovelonis, Markos v Brenner, Alex | 6-2,6-2 |
| ITF Greece F2 | 2018/03/09 11:55 | Petrovic, Danilo v Kalovelonis, Markos | 4-6,7-6,6-1 |