Stadium: Court 4 Round: 25 Ground: Clay
| ITF Hungary F1 Qual | 2018/05/06 08:00 | Andre Biro v Martin Zeljenka | 6-4,7-6 |
| ITF Hungary F1 Qual | 2018/05/05 10:00 | Gostincar, Domen v Andre Biro | 2-6,2-6 |
| ITF Croatia F3 | 2018/03/19 11:00 | Andre Biro v Zmak, Deni | 2-6,3-6 |
| ITF Croatia F2 | 2018/03/12 12:00 | Andre Biro v Peters, Flemming | 7-5,3-6,4-6 |
| ITF Croatia F2 | 2018/03/11 08:00 | Andre Biro v Maric, Filip | 6-2,6-3 |
| ITF Croatia F2 | 2018/03/10 08:00 | Zekri, Yannis v Andre Biro | 0-6,0-6 |
| ITF Croatia F3 | 2017/03/18 08:00 | Andre Biro v Gorsic, David | 4-6,3-6 |
| ITF Croatia F2 | 2017/03/11 08:00 | Andre Biro v Rogic Hadzalic, Alen | 3-6,6-7 |
| Turkey F16, Singles Qualifying | 2018/04/27 07:30 | Smirnov, Artem v Sieber, Marc | 6-1,7-5 |
| Turkey F16, Singles Qualifying | 2018/04/26 07:30 | Kiyamov, Timur v Sieber, Marc | 4-6,6-7 |
| Turkey F16, Singles Qualifying | 2018/04/24 09:00 | Boborykin, Alexander v Sieber, Marc | 4-6,1-6 |
| Turkey F15, Singles Qualifying | 2018/04/17 08:00 | Paul Woerner v Sieber, Marc | 6-2,6-3 |
| Turkey F14, Singles Qualifying | 2018/04/13 07:30 | Jaroslav Pospisil v Sieber, Marc | 6-2,6-4 |
| 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 |