Stadium: Court 2 Round: 27 Ground: Clay
| Turkey F14, Singles Qualifying | 2018/04/12 09:15 | Marcora, Roberto v Pospisil, Jaroslav | 1-6,2-6 |
| Turkey F14, Singles Qualifying | 2018/04/10 07:30 | Pospisil, Jaroslav v Haylaz, Muhammet | 6-3,6-1 |
| ITF Turkey F13 | 2018/04/05 09:15 | Pospisil, Jaroslav v Soares Klier, Gilbert | 6-4,6-7,5-7 |
| ITF Turkey F13 | 2018/04/04 09:00 | Oliveira, Cristian v Pospisil, Jaroslav | 6-3,0-6,1-6 |
| ITF Egypt F10 | 2018/03/25 08:00 | Roman Safiullin v Pospisil, Jaroslav | 6-1,6-1 |
| ITF Egypt F10 | 2018/03/24 08:00 | Lucas Miedler v Pospisil, Jaroslav | 4-6,4-6 |
| ITF Egypt F10 | 2018/03/23 08:00 | Manafov, Vladyslav v Pospisil, Jaroslav | 4-6,4-6 |
| ITF Egypt F10 | 2018/03/22 08:00 | Pospisil, Jaroslav v Kirill Kivattsev | 6-3,6-2 |
| Turkey F14, Singles Qualifying | 2018/04/12 09:35 | Jordan Correia Passos Do Carmo v Sieber, Marc | 4-6,6-4,1-6 |
| ITF Portugal F5 | 2018/03/21 17:15 | Monteiro, Joao v Sieber, Marc | 5-7,6-3,6-2 |
| Portugal F4, Singles Qualifying | 2018/03/14 11:40 | Sieber, Marc v Alejandro Davidovich Fokina | 3-6,3-6 |
| Portugal F4, Singles Qualifying | 2018/03/13 12:25 | Sieber, Marc v Yann Marti | 6-2,0-6,6-1 |
| Turkey F8, Singles Qualifying | 2018/03/01 09:30 | Sieber, Marc v Miladinovic, Marko | 6-7,6-4,4-6 |
| Turkey F8, Singles Qualifying | 2018/02/28 08:30 | Sieber, Marc v Davydov, Ivan | 6-3,6-3 |
| Challenger Bergamo Qual | 2018/02/18 10:50 | Sieber, Marc v Jankovits, Yannick | 2-6,6-3,3-6 |
| Challenger Bergamo Qual | 2018/02/17 12:00 | Daniel Masur v Sieber, Marc | 3-6,3-6 |