Stadium: Court C Round: 46
| Segovia, Spain | 2018/07/31 15:45 | Heyman, Christopher v Monteiro, Joao | 4-6,4-6 |
| Germany F8, Singles | 2018/07/20 11:00 | Pena Lopez, Manuel v Heyman, Christopher | 6-4,6-2 |
| Germany F8, Singles | 2018/07/19 09:30 | Sieber, Marc v Heyman, Christopher | 1-6,5-7 |
| Germany F8, Singles | 2018/07/18 15:10 | Daljev, Pavle v Heyman, Christopher | 3-6,4-6 |
| ITF Belgium F3 | 2018/07/06 15:00 | Heyman, Christopher v Michael Geerts | 6-4,6-7,3-6 |
| ITF Belgium F3 | 2018/07/05 15:35 | Heyman, Christopher v Nikita Mashtakov | 6-3,6-2 |
| ITF Belgium F3 | 2018/07/04 10:10 | Heyman, Christopher v Martinez Sarrasague, Felipe | 6-2,6-4 |
| ITF Belgium F3 Qual | 2018/07/02 10:35 | Heyman, Christopher v Vanhauwe, Robin | 6-3,6-0 |
| Challenger Portoroz Qual | 2018/08/04 08:00 | Celebic, Ljubomir v Cacic, Nikola | 5-7,1-6 |
| Challenger San Benedetto Qual | 2018/07/15 08:00 | Jacq, Gregoire v Cacic, Nikola | 6-2,7-6 |
| Challenger San Benedetto Qual | 2018/07/14 09:15 | Cacic, Nikola v Andrea Guerrieri | 6-3,6-2 |
| Challenger Perugia Qual | 2018/07/09 10:35 | Velotti, Agustin v Cacic, Nikola | 6-1,6-3 |
| Challenger Perugia Qual | 2018/07/08 12:10 | Cacic, Nikola v Davide Natazzi | 6-3,6-3 |
| Challenger Recanati Qual | 2018/06/30 17:25 | Zhizhen Zhang v Cacic, Nikola | 6-7,6-3,6-4 |
| Challenger Almaty Qual | 2018/06/09 05:35 | Cacic, Nikola v Renta Tokuda | 6-7,4-6 |
| Shymkent, Kazakhstan, Qualifying | 2018/06/04 05:00 | Jurij Rodionov v Cacic, Nikola | 7-6,6-7,7-6 |